You might want to really stabilize your perch so there is no wobble or tipping. Also, they may like to have a small ladder to the perch, if they are standard breeds. Easier access for the fat hens!
What I've read on the DLM states one could build on it all winter and clean out in the spring. I've just started it and have noticed the big difference in the smell in my coop. Now that I have more birds in this coop, it was starting to get a little bit of an odor, but now I've got hay on the floor and it just smells good in there. The hay has been down for a week now.