Re the cabin space, I have decided to push the centreboard aft so that the front of the case sits under the bridge deck and have a dagger board just ahead of the mast step to give lateral resistance matching the sailplan. This means no centreboard case in the main cabin space. You can hopefully get the idea of this with yhe model pics below with white cardboard in the model representing the centreboard case and forward dagger board case.
And now for the cabin. I am experimenting with a stitch and glue structuring of the cabin top. The pics below shows the "chine lines" on which this cabin top will be put together. I'm in the process of spiling the patterns for the "planks" which make up this cabin top. The strata in this mock up will not be part of the structure - it's just there to show the lines. More to come once I have had a go at making the stitch and glue model.