These are the four major parts, 90% of the machine work, and all of the complicated bits.
1) This is a "fat bolt" design, meaning the bolt body is larger than the locking lugs. The bolt is drilled for the firing pin, necked down for the lugs, and the lugs are shaped by making two parallel cuts and rounding the corners. Mostly lathe work, with the flats for the lugs milled. The round ends of the lugs could be done on the mill with a rotary table, or for that matter with a belt sander and a steady hand.
2) The receiver is bored from each end, with a web at the barrel end. The web is drilled, then cut away for the locking lugs. The Maadi uses round lugs instead of square, so you just jog left and right for the cuts, no big deal. My Gorton mill should have just enough Z clearance to make the cuts, but if it doesn't, I can make a fixture to hold the receiver on the lathe cross-slide and put an end mill in a collet.
The barrel end has to be threaded for the barrel. I hate single-point threading, but it will build character, I guess.
3) The locking ring is thickwall stock, threaded. It's the jam nut for the barrel, like a Savage bolt-action rifle.
4) The barrel has to be threaded.