I knew about the humidity escaping part and already have a method for keeping it in, along with humidity gauges to monitor it. hes actually in shed right now and has been shedding fine. ive used this method for my other reptiles in glass enclosers. As for it being to small, i am working on building a larger one, but i hes still very small so he will be good for a little while longer.
However, i youre right should deffinitly cover up some of the sides. i havent seen him run into them yet but i dont want to wait till he does.