To try something different, but I've set out to build a dombra. I've made the fixtures to build a seven ribbed bowl-back design. I bought a very good book from a fellow in Kazakhstan which contains valuable information about the traditional Kazakh methods of dombra construction. But alas, no plans, or even templates to help me start. I made a false start, wtih ribs that would not close together, and a neck block that was much to small. My second attempt is going much better. I set up a laser plane to mark the line for the joint of the side ribs to the next ones. I think it's going to work this time. In the first picture you can see the line of the laser, which I marked and then cut. In the second picture, the cut sides with beveled edges are in the form, and snugged up to the now correct neck block. The neck block is integral to the neck, and the whole instrument minus the sound board is built on this form. There is a clear plastic template on top in the second picture. This is the template I made for the rest of the ribs and so far it looks like everything will fit up.
Reminds me of the old Persian idea of discussing a plan twice, once drunk and once sober. That way you get twice the perspectives on how, or if, it will work. Some might say I tend to neglect the sober bit.