I am fairly competent with electronics, so I can handle any water-related risks. Although you are right, it is a major issue to contend with. I originally had the turtles on the bottom shelves, but moved them up one shelf so I could use gravity to siphon out the water. Immediately after I moved them, the siphon broke. I have a non-gravity powered siphon now, so I'll move the back to the bottom two shelves. Water should then be less of an issue.
I think you are right about the temperature, I'll check to see how much heat I get just from the turtle lights. It may be plenty. The temperature in this building is unpredictable, so I will definitely be monitoring it constantly.
I have smaller colonies of hissers and orange head roaches right now. I don't need to fill up all my bins, but I do need extra bins in order to do research. Essentially, I take adult roaches from the main colony, let them participate in learning experiments, and then put them in an empty bin. Once they have participated in one experiment, I can't use them again. But, I can let them live out their life in comfort (more than most lab animals get unfortunately), and their offspring can go back to the main breeding colonies. When I am collecting data I go through bugs pretty fast. In the last experiment I used up all my adult hissers and orange head roaches in just a few weeks. They got to taste sugar water with small doses of ethanol. They liked some of the drinks pretty well, but there is a point where it gets too strong for them. Later, when I have more new adults, I will see if the "mixed drinks" affect their learning and behavior.