I am not a carpenter but couldn't afford to buy or have one built so I decided to build one and I think it will serve the purpose and also started on a tractor with left over lumber. I figured I could also use to put new chickens in for a couple of weeks to make sure I don't bring any illnesses...
I had seen on here that putting river sand inside works great and stopped by this morning at a company that sells rock,sand, dirt and I ask if they had any river sand and told them what I was planning on doing with it and they didn't have river sand but said she had customers that uses their red...