Oh man Ken a controlline 80A would indeed be an awesome project, that would be so cool! I have done quite a few multi engine projects up to six engines but just two tri motor ships an eighty five inch span Stinson and a sixty inch Fokker F7. The Fokker has OS LA 10's and external scale controls and the Stinson has OS 25AX's.
I have only messed with one controlline multi engine in the early sixties, it was a Berkeley Douglas A-26 and has two cantangerous Fuji .29's. Man that thing chased me across the circle more times than I care to admit. That was the last time untill recently I am finishing up a little profile p-38 with a pair of Enya .09's. Hope I,ve learned a little more in the meantime on how to keep a multi on the lines
That Boeing project of yours is very exciting.
John