Re your Mega ACn 22/20/3 motor questions, they will draw each
about 43A on 14 GP 3300 cells in the Midifan and deliver around 600 Watts each. Or you can use smaller sized GP cells and loose weight - at the expense of duration.
That means that you either fly on two 14 cell packs (28 cells total), or you feed both fans with a single battery, in which case you will need one 16 cell GP 3300 pack and you'll be drawing ca. 80+ amps full throttle which is quite a bit.
Flying on a single pack can be done (I've had a few flights in this config.) and it cuts down on maintenance.
By the time you'r done with the build maybe you'll consider LiPos and retracts
Hope this helps hwh