That looks good tex!
BE I have no clue about the Radeons. Not sure if all the manufacturers hold tight to ATI's reference either. Might be best to just get the card and measure it up before installing it. Some of those cards had that raised spacer around the GPU. I think they got that fixed though.
My GF4 MMX look pretty weird. it has 4 holes around the GPU and then 2 mounting holes that the current HS is using. tex sent me a IGES file of a GF2 but it doesn't look anything like mine.

I thinkI am going to use the 4 holes around the GPU insead of the standard mounting holes anyway. That should give superior mounting pressure.
Also note that card is now installed in my Antec SX830 with the Asus A7V8X-X. One thing ASUS did nicely on that board was rotate the CPU socket 90 degrees so hose routing will be easier. Going to look pretty good with my KingPin CPU block, King Pin GPU block, and King Pin North Bridge block.

Going to use clear tops on all of them as of now. Might go with Copper top and solder on some 45's for the GPU though. I also have another plan for the GPU's in/out's which I will try and draw up when I get a chance.