I'm selling my A4000 in an E-Box tower. I used this tower with my Cyberstorm PPC card which died on me a couple of months ago. It's tested with the Warpengine from my A3000T and works fine.
* A4000 mainboard (rev B) with A3640 CPU card (rev 3.1), 12MB fast and Kickstart 3.1
* E-Box tower painted black with ATX PSU
* Mediator board with Voodoo 3 3000, TV card, Soundblaster, Network card and Mediator MMCD
* Black CDTV keyboard and standard mouse
* IDE CDROM, SCSI CDRW, 4GB harddisk with clean OS3.9/Mediator install and a disk drive.
The battery has been removed ages ago but I think there's some damage done because I'm unable to save the time. In the time prefs the save button is greyed out. Everything else works though. Plug in a CPU card and you're ready to go.
PM your offers. I'll list this on Ebay next week.
/update
It now includes an A3640 rev 3.1 CPU board.