I have built quite a few over the years utilizing several methods;
1. Standard brush pile with larger Osage Orange or Black Locust as a base. These rot resistant trees will stay viable for years, as fenceposts 50 year mark is nothing
2. Cut barrels in half and then cover with brush, I usually utilize 4" plastic pipe in the ends for a chute
3. Stack up old oak pallets (Pine rots too quickly) with good hole in the center, cover with a waterproof fabric and then brush
I talked to the local wildlife management officers and they stated these are the most effective however rabbits need salt. If legal in your area, place salt/blocks in your rabbitat and you will notice large increase in offspring. They stated they will produce and raise up to three times the amount if they have salt.
For #3, I you stacking them in a circle so that there is not pallet in the middle? I may be able to source some pallets cheap, so this appeals to me.
