I am later going to be jealous of you all building this, but I really do not have the resources to do this now. Several torch cut Z-70 SMGs.
https://bowmanarms.com/sign-up-lists/star-z-70-parts-kit/
As is usual these days, there is no barrel which seems the hardest issue, but it does have a nice looking magazine and seems to have all other small parts so if you know how to reweld, this is your deal.
If you know where to get barrels, or have other resources to get these completed, contact me and I'll post it for everyone else so they know also.