Cool, thanks to everyone for the info and links! Being low on funds, and making the bolt...I might as well make the others also. It's been almost 20 yrs since I woked as a machinist, so I need the practice for some upcoming projects!!! After talking this evening with the guy who owns the mill, we're going to transport it over to my place and set it up this weekend so I'll have unlimited use for a couple months or so.
I'll have to check out the saiga bolt. Sounds like what I plan on doing is pretty much what they did. I'm making the third lug from the bottom section. Adding the forward extension allows me to keep the same thickness/depth of the section while making a lug out of the forward most section of it. I couldn't figure out why the lugs were offset from each other either. Mine will all be the same plane.
I've been looking over the trunnion section. It seems pretty straight forward. There's a few cuts I won't bo doing since I'm altering it a little. There's lots of tooling marks left in the yugo one, so it wasn't too bad to figure out what tools and from what direction cuts were made. Some of the cuts look like they were made to allow room for the other bits to come in from a different direction and serve no other function. There's a few spots where I can beef it up without causing bolt interference. I figure a lot of it's going to be "cut to fit" until everything is where I want it and it locks up properly. The barrel can be moved in and out for the final headspacing. I'm using a block of O1 tool steel which isn't bad about warping during heat treat and is through-hardening and easy to get down into the spring hardness levels. I'll take photos of all the set-ups and tooling as I do it. If it all works, there'll be a nice photo-how-to...if it doesn't work, well, there'll be a nice photo-how-not-to!
After studying the carrier and seeing how they did their's, man what a pain. Looks like it was done starting with some round stock and the main bolt hole done. After that, anything that doesn't look like a bolt was milled off. Not really difficult cuts...just very time consuming when the mill I'm using is a smaller one and can't do thick passes. I did some .050" cuts when doing a FAL upper and it liked to have killed the machine! I think I might just get a carrier. I have one, but since I won't be scavenging the other parts, I want to keep it with the rest of the M70 parts and just make the M70 at some point. Carriers pop up regularly on gunbroker for ~$25-35.