Well, the transport issue wasn't a concern until I sold the Suburban! My wing is a single piece, so there's no turning back now. I suppose you could build the wing with removable tips, either at the dihedral joints, or outboard of the aileron servo's. In either case you'd need to fit some kind of phenolic/carbon fiber wing tube set up, and make sure there was a way to undo any electrical connections on the outboard side of the joint. Not particularly difficult, assuming you have all the equipment you need to keep the joints and wing tubes square. Where this would get real interesting is if you did the separation at the outer dihedral joints... none of the angles are 90*, so you'd have an interesting geometry problem.

Another interesting approach might be to build it as a two piece wing, with the joint in the middle. That's the way the new H9 Mustang wing works, with a wing dowel and wing bolt in each half, and a wing tube in the middle for strength. This would probably require using two flap servos, one for each wing.

There's a fairly big tank bay in the nacelle. 10oz tanks shouldn't be a problem, maybe you can find some "squarish" 12 or 14 oz tanks. Unless you're going to try for marathon flights, I'd think 12 oz would keep a Saito 80 running at medium throttle for 15 minutes or so. I'd think 15 minutes of "wondering if an engine's gonna quit" would be plenty for one flight.