I hope someone else finds this useful; I've shared my findings on the Pro, Pro floppy drives and the XSIMM10ss:
https://gamesx.com/wiki/doku.php?id=x68000:x68000_pro_capacitor_list
https://gamesx.com/wiki/doku.php?id=x68000:cz652c_floppy_caps
https://gamesx.com/wiki/doku.php?id=x68000:xsimm10ss_-_memory_expansion_board
... at some point I'll also get around to adding my X68000 GCC graphics programming examples to the wiki too.