At my old house I made a bunch of custom cabinets with frame and panel doors. I left a space for a place to keep the dog while I was at work. The original kennel had wood and metal which didn’t hold up well. It was time to make a dog prison. The metal supplier sold me some square tubing and 0.25” metal rod. That’s right, this prison will have bars. Welding the pieces was easy, but very time consuming. I mainly TIG welded the metal. It was rather difficult to get the final product in the basement, but once in place, it fit well. Knowing how heavy the metal would be, a wheel was added to the door to make it easier to open.