I'm going to allow drainage of excess water through the bottom and I'm also looking at reinforcing the sides with reeds or something as they become available. I'm still in the planning stages right now. I might treat it with something but if I do it will be some other kind of natural paste or something that I can make that will not leech gross stuff into the soil. It's a good point, though, and I'll be keeping a lookout for solutions. Thanks! :)