Sounds like a fun project, but if you want it to stay in the van and not explode in the print bed, keep the geometry simple. A modular stack of flat trays with a few clever cutouts for common items works better than a fussy “designer” thing that will print with too many support headaches. Use a 0.4 nozzle, 0.2 mm layer height, and a solid bottom so you don’t end up with a half‑printed shelf that collapses. A little hidden hinge in the back can let you flip it open for quick access, but don’t go crazy with too many moving parts—printability wins over aesthetics every time. If you really want a visual statement, go for a matte, dark paint finish that hides the filaments and makes the whole kit look like a piece of art rather than a pile of plastic. And hey, if you can’t get the printer to cooperate, just keep the walls thicker than the usual 0.8 mm, because nothing kills a project faster than a fragile wall that snaps during a road trip. Good luck, and keep the design lean—your van won’t appreciate a 10‑layer wall every time you need to load a new bag.