Hallo,
on a Orchidshow last week in Dresden, Germany, I have seen this Tomatoe-greenhouse used to cultivate orchids inside.
The owner is using a fogger to moisture the orchids. The lattice shelves inside are installed vertical, so the mounted orchids can hang on it. A small ventilator is moving the air inside and an other one is blowing fresh air inside. On the top are installed T5-lamps for additional light.
I found, it's a good idea.
Greetings Karina
PS: Please excuse my english, it's not the best.