I am going to make three nesting boxes together (so it'll be a three foot long thing). To keep things short, I need to know if seven inches is too high to have the nesting boxes? Let's see, how do i explain this.....The frame has a 4x4" base and we are going to put a seven inch board behind it and make the frame of the nesting box behind that, on 2x4's so they'll have to hop on the 4x4, and then hop over the 3" lip to the nest, which will be about 3" below, but there will be bedding so it'll be more like 2". Get what i'm saying? I hope so, 'cause that was alot to type with frozen fingers! LOL (i just came in from building....and it's kind of cold out!)