can someone please tell me what the guidlines are for building a rack as close to this one is as possible?

http://www.boaphileplastics.com/rhin...ball_room.html

i know i need a piece of wood for the back,sides, shelves, and bottom. im just wondering what the measurements i need are, how far apart the shelves need to be, and what kind of sealant and supportors i need??

it would really help me out if someone knew this.. or if anyone has plans for a 4 or 5 slot rack for tubs that would fit adult BPs(36-41qt) please let me know asap.