Hi. Yes, I agree. There were countless hobby builders who had "companies" they ran out of their garages -literally. The downside is that there is no enduring historical value attached to any of those kits. The upside (many times) is that they are usually well-built/finished drums due to the fact that all the work is done by one person who can take the time to get all the little details right. And that was often their selling angle, too.
It's difficult to say what the tuning system is from the pictures If the lugs are not anchored in some way to the shell, then it is a single-tension system -where the top and bottom heads are simultaneously tensioned when the thumb screw is turned. I'm not sure what ramifications this has on getting the widest possible tuning range, but I'm sure the idea behind it was to try and allow the shells to "float" between the two heads and make it a "more active participant" in the overall sound. If you have the money and the inclination for such a thing, then they might turn out to be real gems! I'm very curious about it. Let us know if you decide to nab that one.Burger Kin