@ledoux1238 , I believe if the Nova was brought up to a certain series (5/6/7?), including the maglev platter, eclipse, etc. and the aluminum sub-chassis were implemented, it would be there at Cosmos level. (Someone with more background on that, please chime in if I'm off there.) As I mentioned, there was some mods to the body parts necessary to accommodate the upgraded sub-chassis. I'm sure total cost is based on state of the Nova.
I believe the Onyx is an upgraded Millenia. It had a substantial motor with dual belts, large (upgraded) platter, multi-tonearm capability, the same controller assembly and vacuum as the latest Cosmos. Essentially twice the price as a Cosmos w/vacuum. (no dustcover, but Ken said they could make one, I think.)

