I had a nice long weekend to play around with my floorboards. Got started on Saturday and during the first weld I realized the argon bottle had run out. I then found that NOBODY has welding supplies on a weekend! Not wanting to give up two days I fired up the old Harbor Freight flux core welder. I had forgotten how bad flux core welding is. What a shame it's kind of an entry level machine. I think a lot of beginners would give up before learning to weld.
Any way, with sheer volume of metal I think I achieved some joints strong enough to hold my body weight, and with lots of grinding and sanding they pass as rustic looking. One thing I didn't plan on was the time I has to spend getting my shifter too work. The restriced travel length made it difficult to get a choice of upshift or downshift: only one or the other. After tinkering for hours with leverage and travel, I got it to work, as long as it stays adjusted...
The pivots, as predicted, added quite a bit of complexity and time but after our discussion, and the thought that as I get used to the bike my turns may get sharper and deeper over time, I thought it was the safe way to go.