Yeah defiantly need to get an extraction fan inside, there is a hole at the top where I'll be inserting an extraction fan later.Temps def need be below 79. You might be able to run 600 if you turn that fan around and have it pull air out.
Could also get one of those 300 CFM CPU fans and make a small cone for it in that hole you got below.
Push all that hot air out.
Otherwise it looks like some fun you got going on there buddy.