So much for exploring 3D printed gas tanks.
No funds left for exploring that further.
This $150 Columbia 1937 board tracker was begging for a real tank so I made it into one.
It's just decorative sheet metal held on with some screws through the sides.
I used a couple of struts to widen and hold the sides in place, and made a couple of poster board templates for metal to go around the whole thing.
I took it to the welding shop around the corner with a petcock I took from a kit tank and a new filler neck and cap, and of course the bike so they could fit right....