David,

I am an industrial designer and engineer. A main part of my education is fluid mechanics, (liquid- and aerodynamics) and instrumentation so of course I immediately see these kind of modifications you show, the holes and shear webs, are not a result of real engineering and/or calculations. Writing about that never can be a problem, for me, it is the goal of RCUniverse, sharing know how.
BTW, same story, the fuse of the foam cutter, but that’s much more riski, because of life danger!

Cees