@TheDaddy,
I have an FPGA Arcade Replay board now and I am interested in a case for it. Once MikeJ has worked out any remaining features he wants to have in the firmware and is ready for the next production run (which I believe he stated would have all components installed by the company doing the PCB production), sales of the Replay should then proceed without further delay and should number in the several hundreds, if not several thousands. So, I believe that there will be a demand for a quality case design from many of those future buyers.
Make it so it can use MikeJ's I/O plate, as Mike has offered to sell them and also to take trade-in's when the daughter board is released for a new I/O plate with additional holes for the daughter board's ports in addition to the standard Replay board's ports.
I think there will be a demand for two designs. One small as possible design and perhaps a second design that is like the A500, A600, A1200 wedge cases that include a keyboard.
I see the FPGA Arcade Replay board and it's daughter board (when released) as a good alternative to an A1200 w/accelerator & accessories, but not as a replacement for big box Amiga's with Zorro slots. Not unless MikeJ decides to make an expansion board that can connect to the Replay board that will give us a larger daughter board that has Zorro & PCI slots, so we can build a system out of it to rival our current big box Amiga systems.
As someone else here has already stated, the possibilities for future expansion and features are not limited and this project will most likely have a long and glorious future ahead of it. It has only just begun!