Yeah, I used to have an a4k that I towered and got a Mediator for. My setup was:
CV64/3D+Scandoubler (for games, etc)
Voodoo 3 3000 (for workbench and extra ram)
Spider II USB
SB128 (never got it to work)
TV Card (never got it to work)
Fast ethernet, worked awesomely
For me, the only issue with doing this is the lack of decent tower solutions. I'd gladly tower all my a1200, a3000, and a4000's in the future and put mediators in them if only more towers were around! I don't like fitting this in a desktop case (the Mediator 4000Di, for example) because the graphics cards generate so much heat. Plus I like to be able to put zorram and deneb cards in there if possible as well.
