The heat shield is made from 1/4" tile backer to which has been glued 24 gauge steel, although I have used 16 gauge steel for the left side and base. The base is attached to a frame of 1"x1" steel tubing, and is 2" off the floor. The front edge of the base has a lip to help catch any embers that may fall.
I used stove gasket cement to bond the steel to the mineral tile backer. The shield is attached using carriage bolts and spacers to leave a 1" space between the shield and sides of the wagon. In the lower right of the right hand heat shield is a 5" x 2.5" combustion air vent.
When I am able to move the wagon out of the shop I will fire the stove up and use a laser/infra-red thermometer to check the effectiveness of the heat shield. I only intend to use the stove lightly to take the chill off the morning air, but would still like it to be far more safer than it needs to be.