Chicks in new tractor

We moved the broiler chicks in their new tractor yesterday, they were getting crowded in the field brooder. They went from 16sqft of pasture to 50sqft, and they are loving it:

The tractor is made almost entirely of recycle material (wood from the old deck, roofing was given to me). I added a shelter area since it is getting rainier, and nights are cooler. This is the shelter, open for the pic:

This is the whole tractor, with the shelter attached:

It takes the chicks two days to make the grass dirty, and at the rate their feed intake is increasing, I will soon have to move them twice a day.
I hope this tractor will be big enough to hold 25 broilers. We'll see next year, this is our last batch for 2010.
Now that the field brooder is empty, the peacock, which is still in the brooder in our living room, will discover the great outdoors. We will set him in the field brooder.