This one is basically patterned from one that was manufactured quite a few years ago called an A-Just-a jig. however this one is no wheres near as good as the old one which was great. With A-Just_a-jig you could build entire wing on it including the dihedral and all the sheeting except a small area in center.It also was elevated so could be swiveled to enable working top or bottom. I left hobby for about 20 years and sold it. No longer see it available. I don't see much advantage to what they are selling.