Going to build my first rack!

Okay, so I'm going to be building my first rack ever!!! I drew up the basic plans but before I go out and buy everything I just wanted to get everyone's opinion on whether it'll work or not or if i need to change some things. I'm sorry for it being done on "paint" but my scanner won't work right. Here is the basic plan.
http://img18.imageshack.us/img18/5622/rackplans.th.jpg
now this is a 4 tub plan, my original idea is a 10 tub plan so everything is the same except the height which would be 66.75" or just over 5.5'. Please let me know what you guys think. If it's good I'll probably try to get it done this weekend.... hopefully:rolleyes: