No need to appolgies for being a noob !
We've all been there, 30+ years ago for me though, lol
OK, done a little digging on the Show us your 22 thread and found this !
I beleive this is what you want to do ?
Apart from the great carbon battery strap, all you need to do is dremmel the two side pods to allow the lipo's to fit that way, the rear bulkhead you mention is not needed if you run Mid Motor Layout !
