Building the strongback
The building platform to build a boat/kayak/SUP/surfboard is called a strongback. In our case the strong back is a simple sheet of MDF/OSB/Plywood cat to width of 50cm and the length of 170cm (If you are working in a tight space, using the full length of the sheet, will enable to the extra space to be use as work table). Attached to a two 5cm x 10cm (2'x4') wooden boards (wooden board should be plane straight).
Put the construction on two work horses or an old table and you are done.
Marking the fishbone placement on the strongback
Correctly marking the the placement of the ribs and the spine of the surfboard is essential for a strong, symmetric and precise build.
We previously marked the fishbone legs placement, but the spine should be attached to the other side of the wood block (the location of the straight edge), To mark the legs placement on the other side, simply align the fishbone spine slots with the strongback marked slots lines.
Mark the spine legs location on either strongback or the wood blocks.
Connecting the fishbone to the strongback
SUP building classes