I have a 40 breeder sitting around with nothing in it and my fiancee and I are going to start breeding rats pretty soon. The dimensions are 36" x 18" x 16". So how many separate rat parts could I have in it? 3-12"x18"x16"? Would that be enough/too much for it? Issues I may run into? I assume if I could pull off the 3 sections I could always do 1 for the guys, 1 for the girls, and 1 for the childrens.