I have a problem, I made my RV fully modular by making a grid inside to build like if you were in a minecraft house. But I have an issue: it seems the game doesn't allow to put parts in those hitboxes, like if they were "overlapping" what isn't the case as hitboxes are like air cubes so to say.

Will investigate how to accommodate this. I've seen it become an issue with smaller custom parts.

Addressed in V14.2.0.