Difficulty from 1-10: 5.5
The bothersome part was shaving away the internal walls so that the reciever and the mag well would fit. It was hard trying to figure out which one to shave or not to shave. I had to eyeball it, like you said, since there isn't much of a write up. I still have to cut a trough so the bolt can slide back and removed.
Also have to cut a hole for the mag well. Not sure if I want to leave it open or make it tidy and seal around it using epoxy. The ejection port lined up fairly well and clears the stock. I had to cut away some of the stock so that the safety selector can freely move.
Question. How did you support the rear part of the action? As of right now, the front part is stable using the screw from the airsoft. The rear part is just free floating.