So excited that you guys are working on this - one of my holy grail upgrades!Not looking into working on anything earlier than the Plus, but I've had plans for reproducing the MicroMac Performer since not long after I found it in my Drexel branded Plus quite some time ago. Started up on the project in earnest four years ago. Hit the back burner for quite some time in between.
As of December, it's been in Germany where @Bolle has read out the formulas in the 5 GALs on the board. He's checking the near complete schematic I'd done with help early on in the project.
It'll be much simplified to support only the Plus on the first go-round. Nothing fancy, no cache or memory shenanigans, just bog simple 16MHz or 32MHz 68030 CPU socket and those for the FPU and its crystal can.
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I've got design examples for a Killy Klip workalike so figured out the mounting of it I think.
No ETA, could even be another four years.