One of our members, when making holsters, does all the assembly then takes the edges of the leather to a belt sander. I think it's BOOMSTICKholsters that does that. Anyway, the idea is get it all together, and instead of worrying about an edge lining up, remove excess so that it does. Incidentally, I seem to recall that he allows a little extra on the edges during assembly because he's going to sand it.