This is for hanging the lights, fans, Co2 burners, carbon filters and trellis. And also the bottom will be lined with two layers of 6mm poly to protect the floors. I never do heavy flushings, so no need for a drain. My biggest problem is underwatering. So Im not worried about my run-off. Over the years I have learned not to use saucers or even holes in the pot (if the pot is big enough). And I am using nutes that don't really need to be flushed out, and I am really easy with the nutes. Some times I only feed once for every three waterings. But I build my soil really well. I use to work for Fafard, which is soil distributor. I am really good with soil, and that is where my skills really shine.