[Yosemite Sam]

This is kind of a tricky one...

A frame by itself, is just a "part", but since nearly everything else bolts to it, it could be considered "The main part".

Here is my best advice: If you feel like changing the frame might bother you later, then it probably will.

Before I got a mig welder of my own, I would put the part in my truck and just happen to stop by the local "Mom and Pop" type body shop just a few minutes before closing time. I would carry the part inside and ask one of the workers how much they would charge me to "weld this back together".

Usually one of the guys would jump at the chance to "show off" his skills and offer to do it for a couple of bucks or for free... I would always give them a generous "tip" for doing the work ($20.00) for a few minutes of welding. If they refused the money (and sometimes they would) I would drop by the next evening with a 6 or 12 pack of a local favorite beer. After doing that a couple of times, they were normally very glad to see me.

Surly to goodness, someone here lives close enough to you and would fix your frame for a 6 or 12 pack.