Oh wow! I actually had to go into the camping stuff and measure it.
It was made from two pieces of 6x218 pieces of bass wood glued side by side. The full depth is about 1 3/4. The trailer and trees are about 5/8 deep and the other three background layers are approximately 1/4 each the lettering on the bottom is about 3/8 deep. A two dimensional photo doesn't do it full justice.