23 center console Cap recore

[JW-Tex]

I have removed the cap and have it flipped over. The core in the bow are of the cap is completely rotted out and gone due to holes where the cleats were ripped out. The cap with no core had major sagging in the bow area when on the boat. Now that it is flipped over once I remove the backside skin what is the best way to core this area and any idea how to get the correct camber (get rid of the sag)?

I plan to use marine plywood and I assume I will cut out a piece roughly the correct size and then cut it into smaller squares about four inches each. Lay the squares on a layer of wetted out 1708 and put thickened resin in the cracks between the squares and then a new backside skin of 1708. Wondering if I will need to place some weight on the plywood to get the sag out and restore some of the camber to the bow area?

Any tips or ideas would be appreciated.