I'm impressed with the early tear down you did. Not that it looks difficult, I just don't have the balls to do that quite yet.
I do agree with you 100% with the negatives: it's uncomfortable to hold (in either hand) and it pinches the thumb webbing. The charging port mod should have been done at the factory. The air gauge is completely worthless due to the location and trigger linkage.
Also on the positives: I think this will be a modder's dream platform. Lots of potential in either using AEG shells or custom stocks. Hopefully there are a lot of AEG electric internal mods that could be done, assuming the mags can keep up.
I'm really looking forward to what you come up with. Great job!