Brandon,I used a batten on the the crown when setting my lines to wood before I cut and then added 2" to that. After I dry fit the bulkhead, I positioned a batten at each bulkhead and "eyeballed" and adjusted until I had the crown that I wanted bow to stern and stern to bow, took me quite a while. When I finished I left it overnite and looked again,satisfied I marked and cut. Hope I explained this right.