There was mention in another thread that the ESM version wing needed strengthening if I'm going to put the Wren 44 Turbo prop in it. What's the consensus on that and what sort of strengthening is needed? A carbon fiber center section tube and mating sleeve I can do but I don't want to have to rebuild the wing. Also, it's clear to me via photos, that the wing is fabric covered open bay on the bottom. The top surface looks to be sheeted. Correct?