For the compatibility layer, stuff it might be worth looking at the old, but open sourced emulator 'executor'. He built a compatibility layer that can run a lo

For the compatibility layer, stuff it might be worth looking at the old, but open sourced emulator 'executor'. He built a compatibility layer that can run a lot of binaries up to about system 6, but without a copy of the OS. (The closest analogy I can think of is like wine, but also he has a CPU emulator underneath with neat tricks like dynamic recompilation). https://github.com/ctm/executor https://github.com/ctm/executor