Need help with my G3-build

[JoFreak]

What? No! I only said that I read about necessary modifications, but didn't know what there would have to be done and haven't encountered any problems while assembling (except that I stripped another one of those bulls**t armorplated gorilla hex screws).
That's why I asked what there would have to be done, as I don't know how important these modifications are. And there is a difference if parts run smoothly when you move them with your fingers, or if they work while put under full stress.

Anyways, if there are points not quite clear to me, I tend to ask before I get out for the first run an everything breaks