wellllllll u see u might want to make ur map better lololol thats wat i wud do but ur 2 much of a noob lolol so go di in a crnor opr smthing kthnxbai
To answer your question, no. You shouldn't have to hollow anything to make it without errors. Also, the engine doesn't distinguish between a ledge, box, wall, or anything else. It's just another brush, to it.