Hackleberry,
I love your brooder!! Showed it to hubby and he is going to start on one today for our girls who are quickly outgrowing theirs.
But......laying in bed last night, I was thinking about what height we wanted it. Then it dawned on me that my chicks like to fly and hop out of the brooder that they are in now. A few have been doing it since they were 5 days old. I have to hold them back but one or two usually slip through. The brooder sits on the floor so no big deal. The height you have yours will be a great fall if one slips by you. Maybe you can add a "porch" under the door to catch any that hop out. Just wanted to warn you so there are no broken wings and such.
With that said.......awesome brooder!!!