Is my partition table corrupt? Why does Boot Camp hate me?

Hi folks
I have an iMac (27-inch, Mid 2010) (iMac11,3, with Boot ROM IM112.0057.B01).
I replaced the internal SuperDrive with an SSD, which is now my primary boot device:
iMac:/ michthom$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *250.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS SSD                     248.1 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
iMac:/ michthom$ sudo gpt -r -vv show disk0
Password:
gpt show: disk0: mediasize=250059350016; sectorsize=512; blocks=488397168
gpt show: disk0: PMBR at sector 0
gpt show: disk0: Pri GPT at sector 1
gpt show: disk0: Sec GPT at sector 488397167
      start       size  index  contents
          0          1         PMBR
          1          1         Pri GPT header
          2         32         Pri GPT table
         34          6       
         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
     409640  484620800      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  485030440    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  486299976    2097159       
  488397135         32         Sec GPT table
  488397167          1         Sec GPT header
So far so good.
I want to use the original internal HDD both to run Windows in Boot Camp mode, and to have a partition for my bulk data that doesn't need to be on the SSD.
I reformatted the HDD as a single HFS+ partition, GUID partition table.
I used BCA to create a Windows USB boot device from the Windows 8.1 media after following the hacking in this link.
When the iMac restarted after creating the 250Gb Windows partition on the internal HDD, I got the "no boot device" screen.
I restarted holding Option/Alt and booted from EFI Boot on the USB stick. Windows installer started, at least. Serial number accepted, on to picking a location.
The installation balked when I tried to select the BOOTCAMP partition, with the warning that the disk was formatted as MBR - eh? Why?
So, the current state of the internal HDD must be wrong somehow, but I don't see how to fix it (confidently) and would like someone to point me in the right direction (please!)
iMac:/ michthom$ diskutil list
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:                  Apple_HFS Internal                751.9 GB   disk1s2
   3:       Microsoft Basic Data BOOTCAMP                248.0 GB   disk1s3
iMac:/ michthom$ sudo gpt -r -vv show disk1
gpt show: disk1: mediasize=1000204886016; sectorsize=512; blocks=1953525168
gpt show: disk1: Suspicious MBR at sector 0
gpt show: disk1: Pri GPT at sector 1
gpt show: disk1: Sec GPT at sector 1953525167
       start        size  index  contents
           0           1         MBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6        
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640  1468478336      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  1468887976      263256        
  1469151232   484372480      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
  1953523712        1423        
  1953525135          32         Sec GPT table
  1953525167           1         Sec GPT header
gdisk has this to say:
iMac:/ michthom$ sudo gdisk /dev/disk1
Password:
GPT fdisk (gdisk) version 0.8.10
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present
Found valid GPT with hybrid MBR; using GPT.
Command (? for help): x
Expert command (? for help): o
Disk size is 1953525168 sectors (931.5 GiB)
MBR disk identifier: 0x4F5BB38B
MBR partitions:
Number  Boot  Start Sector   End Sector   Status      Code
   1                     1       409639   primary     0xEE
   2                409640   1468887975   primary     0xAF
   3            1469151232   1953523711   primary     0x0B
Expert command (? for help): p
Disk /dev/disk1: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 3E1D7EF9-F86E-4552-8F40-BE9754C3C73F
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 8-sector boundaries
Total free space is 264685 sectors (129.2 MiB)
Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640      1468887975   700.2 GiB   AF00  Internal
   3      1469151232      1953523711   231.0 GiB   0700  BOOTCAMP
Any help / pointers gratefully accepted!
Mike

Thanks to Loner T and some more reading, I think I'm now sorted out.
I found that marking the first partition on the USB stick as Active made no difference - my only option was to boot from the "EFI boot" option at startup (when holding down the alt/option key).
So to get the Windows installer to behave, I used gdisk to write a new protective MBR before rebooting to the USB stick, as shown below.
With the protective MBR in place (rather than hybrid), the Windows installer was happy to reformat the chosen partition and the installation began.
I'll try to report back once all is installed and working, but once again I owe my sanity to the generosity and patience of strangers!
Mike
bash-3.2# gdisk /dev/disk0
GPT fdisk (gdisk) version 0.8.10
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: hybrid
  BSD: not present
  APM: not present
  GPT: present
Found valid GPT with hybrid MBR; using GPT.
Command (? for help): x
Expert command (? for help): o
<snipped>
Number  Boot  Start Sector  End Sector  Status      Code
  1                    1      409639  primary    0xEE
  2                409640  1468887975  primary    0xAF
  3            1469151232  1953523711  primary    0x0B
Expert command (? for help): p
<snipped>
Number  Start (sector)    End (sector)  Size      Code  Name
  1              40          409639  200.0 MiB  EF00  EFI System Partition
  2          409640      1468887975  700.2 GiB  AF00  Internal
  3      1469151232      1953523711  231.0 GiB  0700  BOOTCAMP
Expert command (? for help): v
No problems found. 264685 free sectors (129.2 MiB) available in 3
segments, the largest of which is 263256 (128.5 MiB) in size.
Expert command (? for help): x
<snipped>
n create a new protective MBR
<snipped>
Expert command (? for help): n
Expert command (? for help): w
Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!
Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/disk0.
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Warning: The kernel may continue to use old or deleted partitions.
You should reboot or remove the drive.
The operation has completed successfully.
bash-3.2# gdisk /dev/disk0
GPT fdisk (gdisk) version 0.8.10
Warning: Devices opened with shared lock will not have their
partition table automatically reloaded!
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): x
Expert command (? for help): o
Disk size is 1953525168 sectors (931.5 GiB)
MBR disk identifier: 0x00000000
MBR partitions:
Number  Boot  Start Sector  End Sector  Status      Code
  1                    1  1953525167  primary    0xEE
Expert command (? for help): p
<snipped>
Number  Start (sector)    End (sector)  Size      Code  Name
  1              40          409639  200.0 MiB  EF00  EFI System Partition
  2          409640      1468887975  700.2 GiB  AF00  Internal
  3      1469151232      1953523711  231.0 GiB  0700  BOOTCAMP

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