Wow. What can I say. Your initiative and resourcefullness don't cease to amaze me. Yeah, those USSR lenses are the best bang for the buck! I'm guessing you picked up either a Helios 44 (or some other model) or a Jupiter lens. The Helios 44 (if I remember correctly) is simply a re-implementation of the Zeiss Biotar (this was possible because of the split of Germany between East and West, and some Zeiss factories left on the East side I think).
In any case, this is an amazing development. If you can make this work acceptably, this will add a ton of additional value to some people to an already great project.