Did a better job of installing my baffled ebay catch can. Mostly involved various false starts and then just re-tapping the inlet and outlet threads so i could install 3/8" barbs.
Did a mostly proper job of installing the seat relocation brackets i had fabbed. four more inches, what a difference. the way i did it the whole seat, rails included, is shifted 4' back. The rear outside foot is now bolted to the floor through it's relocation bracket. Used a chunk of 1/4" steel that already had the right sized hole in it as a fender washer, with thick rubber washers on either side of that, and then a regular fender washer, and a nylock nut. Should be water-tight and is Not Going Anywhere.
The inside rear foot is more of a trick. That one is above the fuel tank, so i put a 1/8" drill bit in my drill so that only about half an inch of bit was extended from the chuck. Did my pilot hole, then i felt for clearance with a bit of copper wire. It appears that there is about 50mm from the top of the carpet to the top of the gas tank. I might drill the hole (Carefully!) and see if there's a way i can fish a bolt, lock washer, and fender washer from under the truck and install a washer and a nylock nut on top. If that doesn't work, it's either time to drop the tank, or time to spec out and install a nutsert.
Then i took it on a 150 mile round trip to drop off my utility trailer at my sister's house.