Here's what we started with:

My Kids are ready and willing to help.  We discover that what lies beneath are a few problem areas with significant rot.  Adjacent to the forwardmost and rearmost thwarts (seats), rainwater probably sat and saturated the wood.  Over time, paint is no protection, and rot kicks in.  Some areas had no more wood and all that was left was the thin fiberglass skin.

We dug and vaccuumed away, but it started to get discouraging.

My helper finally straightened me out "it's not the end of the world dad!"...

Good Kid!