Never made one, but did a lot of research on them, years ago. You would be amazed at some of the things I studied. Hint, do not EVER read a book on Forensic Pathology, they have pictures, lots of pictures, and about half of them in color. Did you know they have green houses in the Philippines? They are open on each end, and the reason they are built is to keep the rain from destroying tomatoes. There are plenty of plans on-line on making one, some better than others. I vent on one or both ends, especially with a fan should keep heat down. Personally, I would go with a hydroponic setup, instructions also on-line, or grow in pots, or in troughs, to save water. I have a book stuck away on Greenhouses World wide. Some plants do not grow so great in greenhouses, if I recall right. I do recall the Russians bitched about their salads, because (I think) lettuce did not grow well, so all they had in their salads was cucumbers and lettuce, something wasn't available for their salads anyway. You could even grow inside, with proper lighting. I believe it was that book that said a 4 foot square hydroponic setup could keep a family of 4 in fresh veggies year round - that would be with a number of tiers. I saw a lot of greenhouses in turkey. The poorer people made them out of scrap wood, and scrap plastic. Don't know how they had them set up inside, but do know they grew flowers for sale in them year round. Actually, from what you said, I think you seem to have a handle on making one. As for the inside, if you can't come up with an idea on that, I'd advise doing a bit of research on-line on greenhouse, and how they are inside. I've not looked, but they should have something. You would probably want drip irrigation rather than hydroponics. Easier to set up, cheaper, and you can pretty well regulate the drip rate. That is what the Israelis use, and they can grow strawberries in the desert, with minimum water. Take pictures. If it were me, I'd likely experiment with a dew catcher for the water. As long as you get dew that is, and I believe you do.