Adding of TWIN FCS II boxes on a NSP 14’ Sonic

In the goal to make this SUP Race  more stable in strong downwind, I purpose to the French Sailing Skipper : Morgan Lagravrière to solution to add this pair of FCS II twin fins.
Including the reinforcement below the boxes, by a rigid polyurethan foam injection and painting retouch. Pricing 120 € + 100 € for the FCS Performer, tri-fins sets.