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You may not need a new PCB, there are systems with a big FPGA [1] that could make a good host for a RISC-V design.

[1] https://news.ycombinator.com/item?id=21303446

That’s a Spartan 6 but you really want the larger fabric parts. If you go to Digikey they will quote starting at 20k, but on ebay a few hundred will do assuming you have a Vivado license capable of building a bitstream. It is possible to commandeer a board as in that post but often not worth the time vs just making your own. Rarely prototypes with only the power distribution and JTAG appear. Those are a bit easier. Like this https://www.ebay.com/itm/114784061306?hash=item1ab9a9c77a:g:...

That board looks like it might have been a prototype of a Fusion-io card. Compare:

https://commons.wikimedia.org/wiki/File:SanDisk_Fusion_ioMem...

It's basically useless for SoC development, though, as there's no memory on board, no I/Os other than PCIe, and no practical way to add any.

The GPIO is broken out all over the PCB for the NAND. It doesn’t get easier than that

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