I did the same thing and it worked great, next I will use a material available at home depot called chloraloy (shower pan liner), basically its a PVC material that is about 1/8 inch thick and rolls out like material...normally used to waterproof showers. This will allow you to make one as big or small as you want....check it out. Oh BTW you have to ask the plumbing section because it hard to find. Ask for shower pan liner.Built my own ebb & flow system. 2- 2'x3' trays. 15$ home depot. Pumps fitting from hydro store $45. 50- gallon roughneck storage bin $15 Walmart...boom that's it. Simple and effective...BTW..trays are 8" deep. Ill post a pic tonight. Easily saved $100+ bucks doing it myself. Also built a table out of 2x4's. $25 at home depot...MAKE YOUR OWN. U WILL THANK MEFOR SAVING U CASH. Any questions just ask. This works flawlessly.