Worskwell sell relatively cheap frames. But their after sale and support sucks.
My M-062 is currently ridden by a friend that is a disaster for gears of any kind.
He had an issue once with a BB-infinite that I did put inside, probably badly, but except this the frame is still intact.
I will get the bike back soon, to use it as a home trainer.
I've never seen any report about OG-EVKIN frames, where did you find about them ?