It's nice to have a mini longboard for those small days. Small surf happens a lot here in central Florida. I'm excited about building a copy of one of my favorites. I start with making a full scale drawing and from that create the ribs and spar.
Once I have the rib patterns the notches for the spar and stringers are added. This board has 13 ribs spaced at 6" intervals.
The spar and ribs are made from the luana door skin found at Lowe's. I use a bandsaw to cut those out. Most of the interior material is remove from the spar and ribs to save weight. The engineering I use on my ribs and spar are I beam designs.