Whatever you do make sure you can undo it. I mean we think a herp room is great but if you go to sale your house the people buying might not and you don't want to spend thousands on this to only hafe to undo and redo it just to sale your home. I'm am blessed in that mine is apart of my house but still off the main house. As many have said sinks are a must, smooth floors for rolling racks and for easy clean up also a plus, Long lasting cool burning floursent lights, a work counter and storage space for empty tubs and supplys, Also something no one has mentioned is a Q-room some where when you bring in new breeding stock so they can be totaly seperate from your regular snakes (mine is my office on the other end of the house). I don't know how you feed but I have a freezer and rat racks in the works. As for the closet into a walk in incubuator and your set