Please don't take offence at this, as it's meant constructively and not in insult, but it sounds as though your current level of expertise is not yet enough to undertake this job. It's fiddly, cumbersome, time consuming, intricate and requires precision. It also requires accurate cutting, jigging and quality welding (which I certainly am no good at). My bulkhead would be comparitively easy to repair, but I'm replacing it as I wouldn't trust my wormanship. I'd suggest trying to get a friend or fellow enthusiast to do it, or failing that, a decent garage.