I have not had so much time on the GIS build in the last couple of weeks but have managed to fit the supporting structure for the front and rear seat tops and also fit the mast step as shown in the pics below.  I need to mark out and cut the seat tops soon but fitting these will be my last chance to fix any twist in the hull so I will need to do some careful measuring and adjustment before gluing in place.  Last time I checked it was all looking very straight and true so fingers crossed this is still the case.

I have also fitted the daggerboard case that was built some time ago.   In order to fit this flush to BH3 I needed to cut out a section of the top framing on the forward side of BH3.   It doesn’t say anything about this in the instructions so I just made a guess that this is what was needed.