As for increasing the size of the top part, I'm not sure what variety's of tomato's that you plan to grow, but from my experience I would not go with anything less than 5 gallons of root space for large, and no less than 3 gallons for small bush variety's. Personally I think those tubes would become clogged in no time. You can trim them but you should consider the need for doing that in the design, and make it easy to do while the plants are growing.
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