How to set up Airport Express to extend Buffalo WHR HP 54g wireless router

Question

Contrary to what official Apple policy is, it is possible to use Airport Express as a remote repeater using a Buffalo router.
I sent hours setting up this network and wish to share what I learned
I only wanted to use the Airport Express as a repeater to distribute the internet to the far reaches of the house--no iTunes, no Printer, and I did not bother setting security.  If you want to add any of those features please make sure that the basic setup is working as described below.  I have no idea how to successfully set up these features.  My advice is to search the internet for guidance.
Anyway:  how to set up the Buffalo wireless access router to work with Airport Express
Setting up the Buffalo:
From the routers home page of 192.168.11.1, hit the "advanced" box at the top
1.     Go the "Wireless config"   "basic" item.  Give name to your network (spaces are allowed), lets call it "WIRENAME" and select wireless channel 1 or 6 or 11. These channels have the least interference and will tend to work when the others do not.
2.     Go the the "repeater" item under Wireless config.  . " Enable" repeater/bridge (WDS).  Next register the MAC address of the Airport Express.  Record both the LAN and Wireless MAC addresses. 
That is about it.  Your Buffalo system Info page should look like this
Model             
WHR-HP-G54 Ver.1.40        (1.0.37-1.08-1.04)                       
                    AirStation Name              AP001D73DEB2D6                    Operational Mode                Router Mode                    WAN                                                                                                                                                                                                                                                                                                                                                                                                      
DHCP
Connection Status
Communicating
Operation
IP Address
myinfo
Subnet Mask
255.255.255.248 
Default Gateway
my info(Via DHCP)
DNS1(Primary)
my info (Via DHCP)
DNS2(Secondary)
my info (Via DHCP)
Host Name
my info (Manual Setup)                  
Domain Name
earthlink.net (Via DHCP)
MTU Size
1500
DHCP Server Address
10.108.48.1
Lease Acquired Time
2006/01/04 12:03:15
Lease Period
2006/01/05 12:03:15
Wired Link
100Base-TX                                (Full-duplex)                          
MAC Address
00:1D:73:xx:xx:xx
                    LAN                                                                                                                                                                                                                     
IP Address
192.168.11.1
Subnet Mask
255.255.255.0
DHCP Server
Enabled
MAC Address
your address recorded in the repeater tab
               Wireless(802.11g)                                                                                                                                                                                                                                                                                    
Wireless Status
Enabled           
SSID
                                      WIRENAME
Encryption Mode
Not Configured           
Wireless Channel
11Channel                 (Manual)           
125* High Speed Mode
                             Disabled           
MAC Address
your address recorded in the repeater tab
For the Airport express: here is a summary of what the settings are:  Start Airport Express Utility and when it comes up
Select "Manual" setup
On the Base station tab:  Give Airport Express a name, any name and any password.  Do not select the box:  Allow setup over the internet with Bonjour
On the wireless tab:  Wireless mode: Participate in a WDS network
Network name:  the name you gave in the Buffalo router: EG:  WIRENAME
Radio mode: 802.11n(802.11b/g compatible)
Channel : the same as you set in the Buffalo
Wireless security: None
WDS tab:  WDS mode: WDS remote
Check: allow wireless clients
WDS main: the MAC address of the wireless (not LAN) side of the Buffalo router
Access control tab: MAC address access control: Not enabled
At the top of the control box , click on the Internet icon
     Internet connection: Connection sharing: Off (Bridge Mode)
     TCP/IP: Configure iPV4 : Using DHCP
     I put in the address of the DNS servers listed on the Buffalo System info page above.
At the top of the control box Music Icon: I did not enable AirTunes
Printer icon: did not set this up
Advanced icon: leave every thing alone
That is it.  Just do everything as above and your Airport Express will act as a repeater.  (And save yourself a couple of days struggle.)
Phil

Answer 1

Many thanks for the info.
In case you were not aware,the following list of Apple WDS compatible devices has appeared on numerous sites and in numerous Internet links and articles regarding this subject:
3com OfficeConnect ADSL Wireless 11g Firewall Router model 3crwdr100a-72 but ONLY with NO encryption
Belkin F5D7230-4 and F5D7231
BT Voyager 2091 or 2100
Buffalo WGR-G54
Linksys WRT54G or WRT54GS (though v4)
Netgear WGR614 v6