I went with 1 and a half on the outside and 1 inch on the inside. That way it will wrap around the sides completely.

The foam was purchased from the same place I got my cloth from, yourautotrim.com.

I chose the high density foam:
1" X 54" X 108" 60lb. HD 54x108x1 60lb HD Foam.

I used the 3m spray adhesive to stick the padding to the boards

The cuts don’t have to be perfect, but it wouldn’t hurt. (it’s upside down)

Start on the outside. Place the staples almost on top of each other. (many people reccomend a heat gun but it was not required with the whisper vinyl.)

The vinyl I chose was from yourautotrim.com (same as cloth and foam). It’s whisper vinyl black and has a great feel to it. It’s flexible but looks like a soft leather.

Close ups of underside.