Well, here it is in all its glory. Yep, that's 5/16 brake line hand bent for a pickup, return, and vent. You can somewhat weld brake line. My 99¢ paint ran like water since it was about 37° but the Rustoleum blue did the job surprisingly. I took carb cleaner and wiped off the overspray on the pickup, return, and vent afterward.
Barely noticeable. The filler neck is a piece of threaded pipe with a cap. Nothing fancy and real cheap. I'll make a bracket to bolt it to the tub and this can be wrapped up.