I think the Kyosho Zero is their only warbird with a foam core, balsa sheeted wing. Therefore, I'm not sure if you will need to strengthen the retract mounts. I have not built or flown the Kyosho Zero, but I have built and flown the Kyosho Spitfire and Bf109E. The retract mounts in those two planes are rock solid, unlike the weak mounts found in other warbird ARF's. I flew off a grass runway, and the retract mounts held up after many hard landings. As for the servo mounts, you should not have to strengthen them. None of mine broke after a hard crash.