Before buying the marine plywood, the most expensive item in building these boats, we had to determine how many 4′ x 8′ sheets we required. A materials list comes with the plans but the plywood specified is 5′ wide which is not available here. By building a simple scale model using cardboard and bristol board we were able to calculate the widths for each plank and the number of strips we could get from each sheet of plywood.
For the two boats:
The bottom panels: two 12mm sheets ripped into four pieces, 2′ x 8′
The garboards: three 9mm sheets ripped into 16″ wide strips
The middle and sheerstrakes: three 6mm sheets ripped into 8″ wide strips