Plywood Growbox?

yes you will need at least one more drain ( the one you got is a little small, but it will work) for the small puddles they wont drown you plants, as for the sprayers i think you are fine with that. and you should have enough room, but it is looking good.

tom__420 said:

You need some pond liner or something man, that wood is going to warp like crazy once it gets wet

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It won't get wet. You can't tell from the picture, but I have 4 or 5 layers of resin on it and that stuff is used in aquariums, on boats, and in other applications with countless gallons of standing water. It is not water "restistent", it is 100% water proof. Water just beads off this stuff. And like I said, I've seen it used (online) in huge aquariums that are made of plywood.