We made the mistake of buying one of these. We have put corrolux across the back and open end, made a base from marine ply and made a shelf at the end which we rest the ramp on thus creating almost another level. We might as well have started from scratch! In fact we ended up with 2 of them. One is in the aviary and the other beside, the 2 buns alternate free time in the aviary (as well as in a large run on the grass). Neither bun uses the enclosed bedroom in any way -unless I put a box or some newspapers up there for them to shred! As someone said one of ours is obviously a softer wood as both buns have had a go at devouring it and my husband is always renewing bits! We have had them less than 18 months!