The tractors are made of 1.5" thin wall pvc. (If I do this again I'll go thicker.) There is an angle iron frame under supporting the axle under the house portion. (If I do this again I will extend the frame under the sides to the front for better support when lifting to move.
Second tractor has dual axles to prevent the inevitable dropping of one wheel in a hole or such...
There is a five gallon bucket for water plumbed to a pipe with three poultry nipples.
Rabbit feeders are accessible from the outside for daily feed rations.
Eggs are collected from outside the tractor on the opposite side of the water bucket... Three laying boxes are built into the inside with a metal flap that opens to get the cackleberries.
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Overall, this is easy to move. My sons often can handle it without my help. We move them every day or every other day... Guessing the girls eat about 50/50 rations and grass.. Eggcellent eggs!
Hope those pics will help someone in building a chook tractor.
CB