Marco,
I think the concept and layout is excellent. Anyone else see the snake?? Wonderful detail!
Yes, your groundwork is great.
I do not worry about mixing 1/32 and 1/35: I have posted many times regarding that it does not make any difference mixing 1/32 and 1/35 figures
so long as the equipment (Guns; helmets; pouches, etc.) are the same size. I've even posted photos of soldiers in line with dramatic height differences.
Otherwise, I agree with most of what the others have posted. One thing I will suggest is that as the Hellcat wing folded, perhaps it would be more plausible that the wing separated at the pivot mechanism.
Aircraft wreck dioramas are very difficult to execute and I am impressed with anyone who has the guts to attempt one. Martin and Alfred's critiques have good council for your next attempt, which I hope we see soon!