OK, got back to some progress on the bike. Used the Caswell snot to seal the interior, hope it holds. Been off line because I've got a bit of a conundrum with fuel plumbing here, and it's probably, well, important to get it right to make sure I don't get a lap full of gasoline while straddling this home made beast.
Recall I've got petcocks on both sides of the tank here and I need to run an inline fuel filter. Clearance is going to be tough and my first parts sourcing for the application is a total failure. Here, you see a petcock and the filter attached to the carb. In between these two needs to be a "TEE" connector to receive the fuel line from the other side of the tank, joining this petcock to then lead to the filter:
I got the petcocks from Clarke Mfg (they make the big plastic tanks for motorbikes, primarily). They're pretty large and I did myself no good by attaching them so far aft on the tank. Anyway, the Automotive 1/4" fuel line is way too stiff for bending and the fuel filter I bought from J&P Cycles is too long.
I found some more flexible (tho reinforced) moto-specific fuel line in their catalog with some help from an actual human on their end. Plus a shorter fuel filter that should only take up about 1/2" of length, barbs aside. Hopefully that will work
I'll also need a better "Tee" connector for joining the two sides of the tank first before leading to the fuel filter and then the carb. I'm on the lookout for a sort of 3 dimentional Tee, I think: where the barbs are all oriented 90 degrees off of a central origin, each pointing along the X, Y, Z axes...That might help keep the fuel line from making such a tight bend.