This project is looking great! We still use a fairly standard C-128 (J-DOSed w.71 & 81 drives, a 1Mb REU with a CMD 2+1 cart.expander) a lot. Might have to roll up my sleeves too. Somwhere in this mess I have an old Schnedler (sp?) 4 MHz accelerator that might help.
Funny you mention Potty Pigeon - one of my favorites! with Coil Cop and Wiz Ball....