The support struts, although fixed fore to aft, allow bulkheads to be adjusted vertically and side to side.
Below, all the bulkheads are on their support struts.
Time to bring out the laser level (how were boats built before laser levels?). The bulkheads all have the centreline and waterline. These are used to for lining up the bulkheads before they are screwed to the support struts.
