What do you mean when you say “unflush tang bolts”? Sometimes when you put things back together after finishing stock, parts don’t fit as well, finish pooled up in certain recesses. Maybe a better explanation with pics, folks here can help you out before ordering unneeded parts. Looks like a nice rifle, you shouldn’t beat yourself up about some mistakes. As for soldering, it’s one of the harder things to do to control the heat, I don’t think I would tackle double barrels like on a shotgun. My last Hawken I pinned the barrel, but in your situation where it just came lose, not much choice. Like I said, don’t order any parts yet, give better explanations of your issues, so everyone can help you out.
Bob