I do understand the excitement on this. I think of these things all the time. I have kept many planted aquariums and a reef tank. Reefs are fully balanced systems and don't even need to be fed very much. Once you get into this you realize the complexities of life and plant and animal relationships. Everybody eats somebody else. You have to know who eats who, who tolerates who. When you deal with general omnivores, like locust and crickets, this become very difficult as they will eat everything when the population grows. You also really have to balance natural behavior. Chameleons in the wild do not eat many ground dwelling insects, particularly ones that burrow. One of two things can happen. Cham finds the group and devours them all. Or more likely never sees them. You would need to have a source of flying insects, like a bee hive that opens partly to the garage. Though this is unlikely to work as the bees would quickly learn.
Creating a natural food cycle is very difficult for any thing much larger than a few inches.
What you want to do here is evaluate what it is you are really looking for. It is not necessary or reasonable to expect this kind of self feeding. But if you take that out of the equation and say Ok so I will feed few time a week, you can and will still have some flies buzzing around to hunt.
For the rest I would have to ask for a budget and time budget. With a solometer and a number of uvb fixtures, some T5 some the MV bulbs for heat and UVB carful placement of branches you could probably get it right. You will also need plant lights. Assuming you don't want a bunch more hanging lights a 500 to 1000watt High Pressure Sodium bulb and fixture can pernitrate that deep. LED will not reach past 36 inches effectively for growth. You will probably also need to protect your floor in some way. If you do all this it is possible.
A better solution is to use a series of large planter boxes. Then you can light those areas appropriately and connect with branches to travel in between.
