Alright, I've said I will do it and I've already put the project in motion. I have the necessary supplies to start the prototypes and I'm going to put out the idea of my progress. I would like to hear a little about what fellow MWers think (no flaming please).
For the face of the VF-22... I am going to make it an attachment once the YF-21 has been converted into battroid, one could just attach it on maybe via clips or magnet(s). The reason being is that there isn't much clearance for the existing face of the YF-21 as it folds under the top part of the fuselage/battroid hood while converting it from battroid to gerwalk/fighter mode. I could just an entire remolding of the actual faceplate, but the VF-22's face protrudes out just a hair more and I know it will still clip the bottom stem of the antenna.
The canopy of the fighter will entirely replace the current one, so some disassembling will be required.
The bay doors for the VF-22 will most probably be a fastpack attachment like the current ones for the YF-21. Due to the force/stress that the existing bay doors themselves (not the fastpack attachments) undergo I feel this would result in a longer life span for the custom VF-22 bay doors (less cracking, chipping, etc.). I am hoping to make them sit a bit more flush when attached to the YF-21.
I will post up some progress pics sometime soon...
Max
***EDIT***
I appreciate any time, thoughts or constructive criticism. XD