These are 3 A4 sheets (slight overlapping) placed in landscape format. This will give the main deck a total width of 295mm and a full length (including nose) of 630mm :-)
In this shot, the overall shape is visible pretty good.
Itkovian - I created some templates on my PC in Corel Draw. They include the center of the holes to ease drilling too. Then I printed them on normal paper and this I glued with rubber cement (called "Fixo gum" by Marabu). After cutting the paper peels of nicely, and any remains of the cement can easily be rubbed away.
Next I mounted some stabilizing stips. The strips between each rip are cut accoring to the measurements on the bottm, to ensure there is no width variation.