still working on this, i've boiled it down to using a vcs junior motherboard with the 6507 removed and socketed a header to a daugherboard with a 6502, GI  ay-3-8910, 32k ram, and atmega644 and a gal20v8 and some 74 logic (for internal bankswitching), i work 10 hours a day, so spare time is limited, im still working on this, i will have pics soon