Ack-Ack
I know it wasn't flexible, but who cares, as an Evil Con Plane it does not have to be realistic. If they werent flexible so what, make them flexible.
Honestly ack-ack, if you fight this one you are condemming the Super Fokker, the Minigun RV8, the Flying Shark and even SANTA!
Just let it go, and make a goonie bird that bites back.
Besides, a massive goon hoarde turns up, and then it drops the town, and then a few real C-47's take it, could you imagine their faces
when a C-47 blasts them out of the sky?