Third attempt at posting a reply...
Platform Cart (vehicle... confusingly found under the "tools" category/sub-section of the crafting bench/menu) requires 4x metal scrap, 4x plastic scrap, 3x metal pipes, 1x oil. It is unlocked by getting the ingredients and doing the blueprint minigame.
EDIT:
Oil can be found in some of the kitchen areas, as well as a few others.
[Edited by Tamarillo, 5/24/2024 4:54:10 AM]
Fixed and will be up soon.
I got a bit distracted... and busy... However, reporting back now: It definitely works.
Again, thank you. 💛