I see IO is selling the semi-receiver for the Ppsh41. Is that what you used?
Also, I like to remind builders who work on Russian firearms from WW II to think about the following. Go in your back yard and build a 20’ by 20’ shack. Start your work in the middle of winter when the temp gets to around 10 below zero (or move to where it gets that cold). Make sure all your tooling is from the 1920s. Make sure you are wearing boots with holes in them, and some “first rate” ragged clothes. Have a cot in the corner, and a wood stove, a bag of potatoes, and maybe one bottle of Vodka. Build!!!! Before you put the final touches on your firearm, make sure you pour the paint on the ground, and then mix it with several others colors (left over paint from painting their planes). You are allowed one meal a day and not allowed to shave or shower. Now make sure you do a “perfect” job of building that firearm!!! You have two weeks to build your Ppsh41!!!
Looks like a first rate job, you must have had more than one bottle of Vodka. You cheated!!! LOL!