I agree about the photos.
I don,t have a team cover hatch, rather frp cored with balsa.
Balsa rotted out. Cut the frp back with carbide blade into 2" squares.
Then used a pneumatic hammer and a chisel to remove the squares and rotted balsa.
A grinder took the last of it off as I got close to the remaining skin so I didn,t damage it.
Got some foam core and resined it into place. Once the foam core was solid I mixed thickened resin and filled low spots and gaps.
Then used two layers of Nytex cloth and resined that into place to form the back.
Gelcoated the repair and in absolutely solid.
I also fiberglassed reinforcing rails which were layers in along all 4sides for a solid interior frame before installing the foam core. Have a solid mounting for all the hardware, lift rings, hinges so no more leaks.
But photos of yours should help get more advice.