Bulkhead replacement material

[Mike16]

Hi all,
I am new to the forum. Owned a CP16 (1976 model) for round 20 years. Knew the births were going but the stringers seem strong. I was surprised to see the bulkhead that holds the compression post soft. I guess that platform which is fore of the post is called a bulkhead even though its horizontal with a short vertical aspect. Any corrections to my terminology welcome. The post broke, maybe in a grounding, but it came loose. ( Thanks to wake boarding boats throwing a massive swell at the ramp. )
Planning to use Marine Plywood (3/4") and epoxy to wet in, coat and glue to hull. It seems the edges will need to be cut at an angle to fit properly.
Any advice on dimensions alternate materials? Looked at nidacore but I'm not sure if it is structurally sufficient. I plan to add pics once the project starts.

Also is this the proper category for posting, CP16 or should it be in DIY?
Thanks

[Mike16]

These are the dimensions from a tape measure. Like a rough cut.

[Mike16]

Not going to separate hull and deck so the limitation on what will fit through companionway is just under 29". Planning on making 2 pieces of the horizontal bulkhead as below. Internal forward deck I'm not sure the correct term. I will also plan an access panel but not sure the size or location. The original had a quite nice large opening right in the center. The new one will need be much smaller want it at least the size of an PFD, not that I should store them there but maybe an anchor and rode hatch.
Any suggestions or comments appreciated.

[Mike16]

Before cutout

[Cats Paw]

I had somewhat the similar project of bulkhead and compression post replacement. Used 1/2" marine plywood, wetted both sides with epoxy before painting.  I opted for a square compression post. Made it more practical to hang hand lines and a cup for a air horn. Added a 4" high bulk head board forward of the hatched compartment. Store anchor and rode in that open compartment.. Added fiberglass tabbing from all joints for structural integrity. It has been several years and no issues. Best wishes on your project.

SV RUACH C-16 1980