Configure Time Capsule with Comcast Cable?

Has anyone been able to configure NAT on the SMC networks cable modem provided by Comcast cable to work with Time Capsule configured as a bridge?
Cable Modem:                                                 
w1.x1.y1.z1      public IP       
255.255.255.252  subnet mask
192.168.0.1      private IP
w1.x1.y1.z2      gateway
NAT: w1.x1.y1.z1 to 192.168.0.19
Time Capsule:
192.168.0.11     public IP
255.255.255.0    subnet mask
192.168.0.1      gateway
192.168.0.1      dns
Mac Mini Server running web services:
192.168.0.19     public IP
255.255.255.0    subnet mask
192.168.0.1      gateway
192.168.0.1      dns
iMac #1:
192.168.0.17     public IP
255.255.255.0    subnet mask
192.168.0.1      gateway
192.168.0.1      dns
iMac #2:
192.168.0.13     public IP
255.255.255.0    subnet mask
192.168.0.1      gateway
192.168.0.1      dns
I can browse the internet from all computers. I can reach web services from any private computer using the Server's private IP address. I cannot reach web services from any private computer using the Server's public address. I haven't yet tested accessing services from a public computer.
What am I missing? Comcast technical support is useless on this issue. Has anyone else had success with configuring NAT on their modem?

Thank you Linc and MrHofmann. I've tried your suggestions, but I'm not sure I'm implementing them correctly because things still aren't working properly.
By "put the modem in bridge mode" I suspect you mean to disable DHCP and NAT.
I did find a manual for my SMC Netowrks 8014 router, but it appears to be for a much newer version of that router.
I also found a sketch someone posted for configuring a Linksys WiFi router/DHCP server with the Comcast Business Class Gateway SMC8014 Cable Modem / Router. It's physical layout is as follows:
INTERNET
   |
Public Static IP \
174.nnn.mmm.122   |
255.255.255.252   |
75.75.75.75 dns1  |
75.75.76.76 dns2  |
                  |-COMCAST SMC8014
Private LAN IP    | (disable DHCP and NAT)
10.1.10.1         |
255.0.0.0         |
75.75.75.75 dns1  |
75.75.76.76 dns2 /
   |
Public Static IP \
174.nnn.mmm.121   |
255.255.255.252   |
75.75.75.75 dns1  |
75.75.76.76 dns2  |
                  |-Time Capsule --- USB Printer
Private LAN IP    | (NAT enabled)
192.168.0.1       |
255.255.255.0     |
75.75.75.75 dns1  |
75.75.76.76 dns2 /
   |
iMac #1
Private LAN IP
192.168.0.13
255.255.255.0
192.168.0.1   dns
   |
iMac #2
Private LAN IP
192.168.0.19
255.255.255.0
192.168.0.1   dns
   |
iMac #2
Private LAN IP
192.168.0.17
255.255.255.0
192.168.0.1   dns
I now see what MrHoffmann meant regarding the use of the same subnet on both sides of a router, which is Time Capsule in the above. Once I get home and revise things I'll report back on how it works. Thanks for your help and patience!

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