Dave - I use mine for season extension as well and it is great. I have soil in one half and grow the maters in bottomless pots on it. Have done this for years with fantastic results. I have a thread in the Growing under glass forum with some pics.
Built 4 of the homemade boxes as you can see in my posts above this one. Great to know you have two plants in each as I was hoping they would handle that.
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