Not sure why you'd want to. If you can clone the MD-Pro, you can just as easily make your own. The logic is simple (for a FPGA/CPLD) - just a bank selection for the sram, an offset for the final flash address, and the logic for the SSF2 bank control (which is actually the most complex part of the thing and has nothing to do with the MD-Pro itself). The code needed to use the MD-Pro is really straightforward - just set the sram selector, set the offset for the start of the rom in the flash, then rely on the CPLD emulation of the SSF2 hardware for the rest. For what a clone would cost to make, I'd recommend instead getting the Everdrive-MD cart.