This is the Slimmons , one of my simmons designs thinned out and slimmed down to 5ft x 19" x 2" and set up as my first ever thruster.
A full length of the board concave that enters through the nose between the rolled entry to the outside. Full with concave in the middle of the board that then tapers to a chine that runs down the sides where the fins sit as seen below. The centre fin is 5mm lower the the tapering concave out through the tail.
Paulownia vacuum bagged over EPS and lanolin finish
The concave through the nose , contained by the hull entry.
Continuous rocker the whole length of the board