The next step in building your SUP kit is optional. I like to add deck reinforcements to the standing area as they stiffen the deck for very little weight or effort. The stiffening ribs are made from left over material from building the rails. Many builder omit this step all together with out any noticeable problems.
Requirements
Router
1/4″ straight bit
Tools Pictured
The first step is to lay the strips on top of the ribs aligned with the fishbone’s vertical support columns. The CNC cut fishbones do not come with these slots, as this step is optional.
Set the depth of cut equal to the desire height of your material. These strips are 1/4″ wide by 3/8″ tall as they were handy. I usually installed 1/4″ x 1/4″ strips as they leave more material around the fishbone’s fillets. The strips shown are only covering the area that the paddler is going to be standing. 
The reinforcements can be attached with Titebond 3 or epoxy.
