techjet1

IMHO all your ideas are very good ones. I have yet to start on my SBB, but I intend to do some of the things you've brought up. Not installing the inner main gear doors and not using an aft nose gear door will lighten and simplify the model. It does add a little drag, but so what? With the small engine you will not need the speedbrake, and that will lighten the model some more. The flaps will be plenty to slow the model down. Not installing the clear canopy and cockpit would probably save another 1/2 pound. You may even want to consider using monokote or ultrakote on the flying surfaces. They structures are built plenty strong enough to do so, and that would save quite a bit more weight. I do have to agree that it may be tough to install different fuel tanks. The conformal kevlar tanks do fit well in the model. I would consider just using the saddle tanks and a UAT. That would be plenty of fuel for a 12-14 pound motor.

I don't have any personal experience with the smaller receiver, it may be fine in a turbine, but do a thorough range check prior to flight. You may find that the electric air valves are not really any lighter then a micro servo on a robart valve, although they are simpler and may be more reliable.

I think you would have a great flying model with this set-up. Lightly loaded and easy to fly. Go for it!