Bosnian modified SKS
Awesome!
You know, though you may be unable to get an actual Bosnian mag, it's possible someone here could make something for you that would work. It looks like it might be a matter of just mixing the right parts. There are plenty of surplus SK magazines that maybe could be modified to fit and if not, there are also older USA Mags SKS magazines (with the appropriate bolt-hold-open follower) that maybe could be used.
Do you have access to this rifle? If so, I'm sure everyone here would be interested in seeing how the internals work. I'd particularly be interested in seeing how the inside of the receiver compares to the SKS-M receiver pictures I recently posted.
Aside from that, do you have any other information about this rifle? Like how many were made, or how they modified them?