I am about to start on a new rack myself.....it will be almost identical to this one...

http://www.exoticsbynature.com/boarack.html

...with a few modifications...the tubs will slide out of the long side instead of short side...i am using 2x4 for the main supports instead of 1x4...i am putting wheels on it...and it will have 5 levels of 41 qt. sterilites and 3 levels of 15 qt. sterilites....

I just finished up all the sketches of what I want to build and figured out how much it is going to cost me....so I should be getting all the materials next week...then it is time for building....i will be sure to type up a 'how to' and take a bunch of pics during the process