Not sure how much interest there would be, but those wire sleeves from the pulse generator I'm pretty sure I've seen a source for them. At some point in time I plan to buy new super high temp wires just like the stator and pulse generator wires are, but new =) to resell as "rewire kits", might be a bad wording/term for it since it's not the coil wiring, just the main wire going to the harnesses.
Your welds don't look too bad, the two lap welds might have been a little cold (weld built up more than ideal), but welds like yours holds up just fine in 99% uses. It's those bubble gum welds that don't penetrate the metal at all that are complete garbage. It's just for a battery anyway, doesn't have to be too strong when OEM commonly used a rubber strap to hold in the battery lol.