if you know how a to build a Ak from scratch you also have the abuility to copy one. n o one is going to spend hours on hours drawing up plans from existing partas and then hand them over for free. If you have the thousands of dollars in equipment to mill and turn parts and then properly temper them then you can afford a kit to copy. take your dimensuons and then sell it for what you paid or more.
Turbothis on the AKforum has made trunions from scratch about a year ago he did them on CNC equipment contact him. i doubt he is going to giver his hard work away however. You will not be able to build from scratch cheaper than from existing parts unless you dont count your time. the bolt/carrier an trunion are fairly complex. i looked into doing three lug saiga bolts and gave up after dealing with price work to pull it off.
i feel that a company with all the right stuff could mass produce the parts for a reasonable price but why when kits are still around for around $100. for it to be worth it you would need to offer something special that a normal kit dosent have like 3 lugs and the ability to handel higher pressures to allow 308win and other high pressure rounds to be safe. IMOO Sagia would sell a zillion rifles if they offered the 308 for the same money as the 7.62x39but some how they feel adding a 3rd lug that likely costs no differance than a normal bolt is worth $250.
I ha ve looked for years for prints or plans but have never seen them and if I owned them I honestly doubt i would give away something that valuable. Id find a way to make money off them by having my own parts made and sold.
BTW myou dont need a liscence to build parts for yourself. what liscense do you have???????