I wonder if it would be at all possible to use one of the PlayStation boards, like ZN2, and use it as a universal base for an FPGA B Board that could run as many PlayStation hardware based games as possible. Given the number of PlayStation based boards and games, this would make quite a multi. The compatibility issues, though.
The way I'm imagining this is, you take the most powerful and "complete" PlayStation A board out there, and get everything else to run on it. Easier said than done, I'm sure, but given the shared architecture, would it even be possible to take Namco's System 12, and make it run not only System 11 titles, but G.Net, ZN1 and 2, and so on.