This was originally created as a document, but wasn't justified in just words. It explains how to create levels with a scaling of 1 so you can get more accurate proportions. Including Mario's exact hitbox size.
Mario's size in Sketch-up when using a scaling of 1
Length = 333'
Width = 333'
Height = 555'
One effect of tunnels using these proportions is that when
Mario is crawling he will appear above the ground. But
once you stop crawling he will go back, he can't actually
clip through the ceiling.
Another thing, the camera has a hard time focusing on Mario
while in a tunnel like this.
Notes:
Crawling doesn't actually decrease the height of Mario's hitbox.
Other entities size:
Goomba, Bob-omb, Small koopa, Pink Bob-omb, Boxes(Non-carriable):
333'x333'x333'
Super Mario 64 (U) [!].z64 - GOODN64 3.14
CRC32: 3CE60709
MD5: 20B854B239203BAF6C961B850A4A51A2
SHA-1: 9BEF1128717F958171A4AFAC3ED78EE2BB4E86CE