Personally I recommend picking up your tubs first because there are several tubs that are similar and that are listed as the same size but may vary by as much as 1/4" so that may cause fit issues once your rack is complete. If you pick up the tub first then you can build the rack around it so you know it fits perfect. Also 9 levels will be pushing it to get it from one sheet you will need two probably. I have built a ton of these racks so if you would like I can walk you through the steps they definitely aren't complicated. Just pm me and I'll send you my cell number and we can answer any questions you have. Good luck and have fun!