I have my kit, but I am in no hurry to build it.
Just the idea of a semi-auto rifle that takes a 72-rd drum is pleasing to me. Plus, I already have the drums and magazines on hand.
When I finally get around to building a SA Soumi rifle, I'm ready. Heck, I even have the metal lathe to make the barrel bushing.
One way to determine the length of the barrel bushing is to insert a magazine within the housing, and measure the total length of the bushing resulting there from. I hope that makes sense to y'all, it does to me.
It appears that an M-1 Carbine FCG "might" work in the SA version. If so, the trigger housing can be modified as well, resulting in (4) U.S. made parts. The receiver will be the "magic" 5th U.S. part.
The bolt will have to be modified to match the FCG. The length and weight of the bolt can be reduced. The bolt was designed for full-auto fire. A semi-auto bolt will not require as much weight.