Wow definitely two camps here. For me, I'd be worried that the bike has beed pretty abused and what else is hidden under the paint. Those cracks are HUGE. I woild not ride it even on a trainer like it is, and even if all of these repair suggestions would work, I woild not waste my time Rube Glldberging them together. I'd go to a local coop or search on Craigs List for a frame that suits me better and send that frame to to be recycled for a new life as a Cannondale or a Tesla, or as Reynolds Wrap...