Up until the moment I received an email from Kim Scholer, I had never heard of, or at least don't remember ever hearing of, a motorcycle manufacturer by the name of Junak. According to wikipedia it's a Polish marque, built from 1956 to 1965, though it seems there are some later versions, perhaps the company was bought and restarted? The old engine was a single cylinder 350.
It's not a bad looking bike, but the reason I looked it up was because Kim sent me a link to a video of a Junak 700, a home made V-Twin and the engine sounds great. It starts on one kick, settles into a smooth idle and revs just fine when the owner spins it up a bit.
I have zero information on this V-Twin build, but if the Junak is no longer produced, there would seem to be little demand for any more of these V-Twin modifications, or a very limited demand at best. (Wording in the previous sentence was cleaned up after a comment below) It's seems the builder produced this as a labor of love.
Very nice work and if anyone has more information on this build, send it in. I guess Royal Enfields aren't the only bikes being twinned.