Chickens gone wild

[ducks4you]

IF I ever get the time, I'd like to make a "tractor" that is about 6 ft long and 1 1/2 ft high, so that 3-4 hens can work a small area. I believe that it wouldn't be too heavy or bulky to move. I'd like to box in the end for shade and bird removal. sigh
Too much ambition...not enough energy...