I started building a frame jig for mini frames. I used 1-1/4 angle and square tubing to frame up the jig. Its fully adjustable for dead on level on horizontal and verticle planes. The neck is supported on a 5/8ths threaded rod and the rake can be adjusted to any angle needed. When frame construction starts I will level the jig and clamp it to the bench top. The threaded rod will get some machining on it to hold a plumb bob on jig center from the top and have a pointer machined to the bottom side to point on center off the verticle support.