Well, I take all my welding needs to AC (user on the board) - Adam runs a welding shop up near my office. I had my frame worked on at his place, but it was just some bracing work etc. Nothing 'structural'. I'm sure they have the skills to do the work - they make some fancy stuff up there out of stainless steel etc. that require pretty tight tolerances etc.
I'll PM you his number. Tell him Tim sent you (I'm going to see him later today).