Here are the stringers. What's confusing is that the only wood is laid on top of foam and the floor was attached to it. It seems that the fiberglass is whats making up the stringers and the foam is the support. If you look at the far left you can see my screwdriver stuck in the foam where that board was. You can also see where it was placed where the foam looks like it takes a 1" step down. I talked to a tech at Larson and he told me that there should be a board on the inside of the foam against the glass...there isnt though.