RE: TOP FLITE GIANT SCALE P51 ARC
Few years back I reinforced the landing gear mounts by removing the factory rails then replaced by a 1/4" plywood plate glued against the leading edge and running between 4 ribs section. some extra spruce was glued under the plate at the gear mounting bolts location.
The well openings were redesigned to accommodate the Aerotech gear doors. I trimmed The fiberglass bottom leading edge piece then filled with some micro balloon/epoxy mix to blend-in.