Yea, keep everything you want to be removeable, moveable, or lighten by a LED hollow. Mag well, keep it hollow. Safety button if you want it moveable, make sure that you have a hole with a stable wire or something in the middle of it. Add the safety button afterwards. Charging handle, if you want it to be abled to go back and sprint forward with a sprint, hollow out the area for the handle and cover piece. It takes a lot of work, but every function plus a working trigger are in my BR, so its highly possible to do the same. Just make sure that the BR is full scale with no mistakes or anything. Once you make one mistake when you scale the blueprint up, your screwed if you do not correct it.