Thanks, I'm just about to start cutting away to butt join!! , so scary , I hope I won't mess up, I'm leaving 12 mm on each side for the forearms to cover with the 15mm strip, I still have some room inside so I might be able to cut one or two mm in each side, does anybody has an idea how long the butt joins should be or it depends on the size of one's arms?, ohh and on the AP shoulder bells arms and forearms are the same on each side so it really doesn't matter left or right, is that correct?