to answer the first question--yes the bulkheads seem more secure than the GP's ones! The second Q---Yes the nitro has flaps--all servo pockets are cut and hatched in the wing- only servo pockets that need to be cut are in the tail section for the elevator and the rudder-leaving you to either mount them internal and run nyrod, or mount them external like the GP model. only hang-up I see is the lack of threads for pulling servo wires through the wing and hull of the nitro--but being a modeler and a few beers that should be no prob for most of us! Thanks Tom