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Made mine about a year or so ago. Little different from yours, did not mess with pocket holes or any special angles. Used plywood sandwiched in MDF for stability and applied a coat of Poly so the router would slide smoothly. In the photos cannot see the T-tracks slots (cut with keyhole bit) on the bottom for the hold down clamps. Did not invest in expensive clamps, just took some 6" quick quick clamps and modified one end of each, to fit in the T-track. Added aluminum end plates to prevent blow outs and wear on the ends of each piece.
Full size airplane from scrap plastic, hot glue, and washing line.