Found the materials for the box resting across the street from the laundry mat in noport harbor.
Took an old fashioned drawer and handle to a construction site with custom measurements and with a chop saw had it in pieces in minutes.
Next, out to Velella on the north fork for the construction phase.
Finally, a refit this summer/fall cutting it down in size and mounting to main bulkhead in cabin.
Done and well done.