So the only modes left are sr,S and (sr,S),y - neither which I've ever used but I'll put them in for completeness. This hasn't been nearly as painful as I thought it would be, 2-3 days at most. I've still to add all the extra instructions, but they're all just implied addressing (TXA etc.) and are just table modifications. MVN, MVP, PER and BRL are the only ones that need special work, and they won't take long.
Oh....I've been using THIS page as an opcode refrence - pretty good too.