some versions of radeon should be supported, depending on voltage they need, i think there should somewhere be info on the elbox site. but there is still no warp3d for radeon i believe. my desktop solution with voodoo3 is magnitudes faster than any existent zorro card in both 2d and 3d (voodoo got a good blitter too). im able to use screens up to 1600x1200 in hicolor without serious lag. but scandoubling 15khz resolutions is pain in the ass the desktop solution hasnt even got video slot, but thats not the case with tower enchancements. and there might be some problems with some demanding zorro cards like deneb, the dma datatransfer could be less dependable than with an normal zorro busboard (solution: switch to pio).
all in all i would not like to miss my di, even if this is not the most elegant solution
