So you were put in charge of making the 060 based amiga

[ElPolloDiabl]

You don't need an 060 just an 030 Amiga with lots of fast ram for the low end at least.
For the high end put in a graphics card a 2MB low end a 4MB high end and a super high end card with Nvidia TNT2 level performance.
Also put in a software based Macintosh and PC emulator.