The stowage in the Captains cabin besides the water also contains the batteries. I have found a size of nearly the same with as the water jugs so now I have filleted the panels in place.

Big deep clamps holds the port panel in place while the fillets cure. Part of one battery can be seen behind the panel to the right of the picture.
Here a mock up of the saloon, the deck and the two aft windows. The windows have a diameter of 20 cm or 8 inches. Headroom is sufficient.
A cardboard mock up of the lunch box center of the picture in brown. Volyme about 45 liters. The picture shows the port one. There will be another one to the starboard side but not so wide.
The beginning of the real lunch box. I do as much as possible of the work on the bench, for convinience and for better results. Now the box is upside down. Doing filliting and tejping work later would have been extremely difficult.

To be continued…

Regards Yrvind.