23 CC minty green!

[Capt Chuck]

Can I remove this bulkhead and replace it with a one piece unit without pulling the cap off the boat?

NO, You will need to:

1.) Construct a new bulkhead using the old one as a pattern
2.) Cut out new hatch and any other holes
3.) Cut new bulkhead top to bottom @ centerline
4.) Install new in two pieces one side at a time
5.) Quick fair the two seams
6.) Sand, Paint & Caulk

I used 3/4" PVC Board