Growing tropical fruit trees in raised beds within a greenhouse
I'm working on designing a sunken greenhouse to grow mainly tropical fruit trees in. It would be around 40 feet wide by 40 feet long and 15-20 feet tall with about 10 feet sunken underground mainly for temperature regulation. The area that I live in is very rocky, you can't dig down more than three feet without hitting a solid limestone plate. The floor of this greenhouse would be around 7 feet below that level, so my idea was to make 4 to 5 foot tall raised beds and fill them with rich dark soil, adding lots of compost, trace minerals and beneficial microbes to the mix. Would the plants stay healthy and productive in these conditions as long as I keep them at manageable sizes?
My ultimate goal is a miniature rain forest environment in my backyard. Any suggestions and/or constructive criticism to get me to this point would be greatly appreciated.