If you just want to add a Voodoo 3 card in a desktop a4000, you could opt for the Prometheus PCI card instead of the Mediator 4000Di. You'd still have two Z3 slots and your video slot and you needn't get rid of the Cybervision card on the local processor slot. I believe you'll need to use Picasso96 for rtg on the voodoo however, as you're probably using CybergraphXv4.x on the Cybervision right now.
