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So, the next step would by trying to run some code on the PPC and sync it with 68k exec somehow?
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That might be a bit difficult with that design. Remember than sonnet memory is native to ppc and is mapped through pci adressing space (4GB) to amiga memory. Now let's say we have 68040 turbo card, mediator pci and sonnet 7200. You have motherboard chip memory, you have native 68k fast ram on turbo card and you have ppc native ram on sonnet mapped to pci. Accessing Sonnet mem is basically as slow as accessing radeon vram (on mediator). It goes other way around too - so accessing fast ram by ppc is really slow. Optimal speed would be only available if PPC code was executed from sonnet mem alone. That's a lot of hacking I suppose.