I have experience growing the "real tomatoes" AKA cannabis sativa/indica. The "trick" is to find suitable plastic LARGE rectangular containers, like some under the bed storage containers. A 2' x 3' container might be ideal, if you can find one. Your "tomatoes", or at least my "tomatoes" are grown in 3 gallon plastic pots, with drainage holes in the bottom. My medium is peat based potting mix (comes in compressed bales) spiked with plenty of bone meal/ blood meal/ all purpose fertilizer etc, even worm castings or just straight old composted sheep manure. Just don't overdo it on the manure, and I doubt you really even need any, but I have used it, and everything else under the sun you care to mention. the plastic tubs should hold several of the pots, and are supported by an old door that I salvaged. When it comes time to water, you pour the water INTO THE TUB, which acts like a giant watering saucer, and guarantees uniform watering. You can dissolve half strength Miracle Grow, or some such soluble fertilizer to the water, as required. Unfortunately I do not have a picture of my grow, but it looks just like an ENORMOUSLY FERTILE farmers field, with HUGE rapidly growing plants that bear an immense and altogether extremely satisfying harvest.
I imagine tomatoes would be similar.

kinko,

Sounds similar to how I do my seedlings, though on a bigger scale. In fact, I have been considering building a "watering chamber," a 15'x12"x6" (LxWxH) trough that I would line with plastic or something similar. Also add an overhead misting system to provide something similar to rain or morning dew for the plants' leaves.

Mike

In my case I keep the foliage dry, because cannabis will grow well under hot dry conditions, and the buds can get moldy. I would also worry about the mist causing issues with the HID lighting. I don't really believe tomatoes require any "rain".