"The pb with the replay board is it's never ending beta stage.
The hardware has been stable for a long time, the cores and libraries they use have been under development for a while.
"IIRC the FPGA Arcade is closed source, so I wouldn't expect them to make their cores available to other FPGA boards. "
Nope, I've just been reluctant to publish half finished code. It will come.
The Replay libs are there and the ARM firmware in a day or so.