One disadvantage of doing tank parts in plastic is danger of breakage in case of collision. I think ductile steel with rubber connections is going to behave much better in that case.
A shipping container for a gas turbine engine for electric power generation. That one is actually just for the core engine. size is approx 10' H x 9' W x 16' L give or take.
Back to the OT, more parts that could be 3D printed. Fuel cap & flange.
The seat is based on an existing design I found some basic dimensions for then created a model.
The badge I created in SWX from scratch. The Ford emblem is created using an available text font I had previously downloaded then doing an extruded cut like the 351 & cleveland. I have not had any made as of yet.
This is the type of things I design at work. I created this image for the manual for this container. This is a model.