So just going to design it, or actually actually build it?
Low expectation "do-able" project with available documentation ... updated remake the 040 card for the 3000/4000.
Pie-in-the-sky project.... dual coldfire card. First coldfire runs the JIT compiler too manage CF unfriendly 68K code... feeds results to second coldfire that replaces the 68K.
Other than that I'm looking forward to UltimatePPC.
Plaz