Kevin: Being unemployeed and unemployable I don't think I will go the digital servos route but rather stick to "el cheepos". However the idea of individual servos in the rear on elevators sounds like a plan. I to think moving the servos out in the wings for alerons is also a plan, which is what I do on all birds now. Fuel tank will be mounted according to planes, in the nose behind the firewall. I too am unsing a 2.4 gig and with that received takes up very little space and very little weight. So the small retract air tank can be mounted in fuse aft of wings.Using Spring Air with a small control valve and one air line would not take up the space the Robarts would. I also use a Hobbico mini servo to operate the control valve the same as I do on Rhoms in Chaos. It only requires a 1/4 travel and little resistance so the mimi servos are great space and weight savers. This leaves the battery pack forward of the wing saddle behind the tank which should off set the weight of the servos in the tail and keep balance. There is plenty of length in fuse but width is only about 2" , just wide enough for side by side cervos for rudder and engine over wings. This sounds like the plan but you know the best laid plans of mice and men are spoiled by things that might have been. I'll let you know. Again thinks for all your help.