Can a game allow custom models that are bound to a specific size?

I'm trying to think of ways to counter cheating through custom mods as I've seen used in other games I've played. Like changing wall textures to be transparent or invisible (easy; just don't allow them to be modded) or player models with huge axis lines extending from them, so they clip through walls (where my question stems from).

I know I can check for custom model files being used and allow or deny connections, but if I still want players to be able to have custom shit, the next best solution I thought it was making it so a custom model still has to fit within a certain boundary of size, eliminating the huge axis lines and other fuckery cheaters might try. Is that even possible, though? I don't think I've ever seen anything actually do it.

I guess this would pertain mostly to the engine so let's just say UE5 or Unity since those are most likely what I would use.