Now, I've seen some rather LARGE fossil skulls, such as the Triceratops. Therefore, one of two things are possible: A. You are a mythical giant, with commensurately humongous furniture - able to fit a very large amount of fossils onto your shelves; or B. You're statement was inaccurate. I chose the more humorous of the two.
Have you ever been to the Carnegie Museum in Pittsburgh? They have some skeletons bigger than most houses. You can get a fairly complete collection of plaster or plastic copies of the significant proto-human fossil skulls for a a discouraging amount of money, and that collection would not even take up one shelf.