Awesome work! IMO, no camper is perfect, so it makes sense to make one more useful for you! I keep thinking about picking up an older FWC too, but I have enough work into my current camper to not want to get rid of it. Eventually it'll rot and sag enough I'll have to, but until then, I'll use it, and once that happens, I'll probably use parts of it to turn a FWC in to a better one!
As for the welds, I know FWC used to tout the "Flex frame" design... Perhaps not welding it fully kept it flexible enough to work with older trucks that had a LOT more frame flex than the ones we're now used to. If they made it rigid, it would have broken apart, rather than flex when bolted to a flexy truck. ?? Regardless, I can understand that didn't have an answer for why your camper was welded the way it was when it was built 30 years ago...
Speaking of welding, are you TIG'ing things together, or using a MIG welder? Just curious. <Edit - Nevermind. I see the TIG voltage pedal and electrode in the corner of your last working pic.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Keep up the good work, and the reports!!