RE: ........."BELT-CP THREAD"........
I put my EFlite G90(same one) upright as well. I have a digital version of the directions if you need them. As for Rex parts, many fit but every one that I used had to be modded slightly.
Currently using:
TRex SA tail blades(root tip sanded to fit)
Trex 200MM flybar with align carbon paddles(drill out flybar case a tad)
Canopy
3550 motor(if you want the heat sink, you need to dremel to fit)
Head dampners (stiffer for the feathering shaft)
Have tried Main blades but they need 2 1mm spacers to fit grips