I've put the plans online for your use. You may view the plans (and download them) directly from Google Documents: Water Rack Storage Plans
I have included relevant diagrams along with readable instructions on how they were built. Again, these were built over a year and a half ago (as of Spring 2011), so hopefully I have remembered enough of the process to communicate it back.
The diagrams themselves were drawn with a CAD application, and as such I can get different views if there is something that would be useful to you. Let me know and I'll gladly improve upon what I have here.