I'm thinking of going with the 4 servos, just because the mounting points are already there. They're off center, so you'd have to fab up a whole new mounting spot, hack up the covering etc? Probably use something like Hitec 5625's or if I have a few more $$ the 5925's or 6965's. I've never done multiple servos- Will 1 servo have enough power to overcome the other if it craps out? I was thinking the redundancy wouldn't hurt either if it can do that.