The Great Planes Big Stik series was done right, in my opinion. There are little templates that you glue to the inside of the fuselage to get the bulkheads in exactly the right places. My short kit includes this feature, as well as lines scribed into the fuselage sides for proper placement, plywood bolt blocks, ailerons, elevator, and quite a few other parts you don’t feel like cutting out.
Choose nose wheel or tail wheel. If you’re building the tail wheel version, cut the front bottom lite ply piece to accommodate the birch ply landing gear plate.