RE: upside down plants
I haven't had any experience with this, but at least two of the seed/plant catalogs I received within the last two weeks have holders , like big plastic bags, for growing tomatoes like that. They grow up instead of down and can be put on a pole so they don't take up so much room. I'm thinking of trying one. I think the one catalog was called "Gardens Alive." Maybe we can compare notes this summer after we see how it works out. Good luck to you from a fellow gardener.