24.1 Rear Wall Construction?

[Cosmo]

I am adding a rack to carry 2 stand up paddle boards to the back of my Axis 24.1. I was thinking of bolting thru to the rear storage container but after removing the tail light it looks the the wall is constructed of 1" plywood. If so I dont really need to thru bolt. Anyone know for sure? Also does anyone have to exact location of the stringers? I took a pic this morning with condensation and now have a rough idea. Thanks.

[bevedfelker]

Just sent you a PM.