RE: symmetrical wing question..
Yes, and on top of that one the normal setup for all of the hot 3D fun fly flat foamies is an honest 0-0-0 setup as well. But again, if the CG is located forward from the neutral point by very much some up trim will have to be used. It may not be much but it would be there to allow the model to fly hands off in level flight at a moderate cruise speed. And up trim is merely an alternative to built in postive and negative incidence angles. Or as the terms are used these days in modeling some decalage angle or longitudinal dihedral. This is why 0-0-0 setups built into the model are only seen on models where the owner is expected to trim the CG location back enough that it is very close to the neutral point and the amount of angular difference between wing and stabilizier needed will be so small that. it is most easily provided by a click or two of up trim or a turn or two of the elevator clevis.