I saw an ad for a 2XTM magwell kit from "Jack Squat's Flat Spot". He advertises on Weapons Guild and Weaponeer, and also sells them on Gunbroker.
He's selling a plasma-cut magwell kit with locating tabs. Just hold it together with a C-clamp and weld it yourself. You have to bend the feedramp down and to all the shaping yourself.
He's selling them for the Suomi and the PPsh. I got one of the Suomi ones, $22.63 to my door. The Lichtenberg ones were several times, and the 2XTM page on his web site is 404 now.
For anyone building a 2XTM the additional work to finish off the Jack Squat magwell shouldn't be a problem. Now I need to go order another flat...