Thanks guys! I use 700c -28mm tire, don't need to crimp the chainstays. It may be difficult to keep geometry straight by crimping chainstays, but maybe I'm wrong, I have never done it. Below first ''a la 1930'' design frame.
Some shaping tools: down tube arch manual ring roller with oak rolls and seat stay/top tube mold.
Down tube ''thorn'' welded and filed
Seat tube mitering
Frame jig
Patient process, tube mitering
Closer to shape
Drilling ventilation for inner rust prevention
Handmade dropouts...
Designed this frame with ''hot rod '' aesthetics. Materials is columbus cromo steel. Joining methods are brazing and Tig welding. Frame ergonomics is very functional for daily use. I'll try to take a pictures of my next frame building process.