I agree with scottychaos! Trays will help a lot. It's ok to have a little water sitting in a shallow tray. Your board is still going to warp and mold even wrapped in plastic! I still think your humidifier is going to much! Untill you can seal the whole thing properly your going to continue to have leaks! I have a hard time believing your tray will "catch" all the water being created in your chamber. The misters I use run a lot but it is not enough to water the plants. I still top water all my plants. The humidifier is really only to raise the humidity in the chamber not to water the plants. You will continue to battle mold with that high of humidity all the time. You may even get plant molds that could kill your plants.