I quickly modeled it in Delftship and here are the goods assuming an 18' kayak.

Length over all 17.996 ft
Beam over all 1.865 ft

Displaced volume 4.475 ft3
Length on waterline 16.073 ft
Displacement 0.125 tons
Beam on waterline 1.751 ft
Total length of submerged body 16.073 ft
Waterplane area 17.411 ft^2
Total beam of submerged body 1.751 ft
Waterplane area 17.411 ft^2
Block coefficient 0.4326
Waterplane coefficient 0.6186
Prismatic coefficient 0.5402
Waterplane center of floatation 8.807 ft
Vert. prismatic coefficient 0.6993
Entrance angle 9.359 Degr.
Wetted surface area 23.157 ft^2
Transverse moment of inertia 2.889 ft^4
Longitudinal center of buoyancy 8.700 ft
Longitudinal moment of inertia 208.33 ft^4
Longitudinal center of buoyancy -1.343 %
Vertical center of buoyancy 0.231 ft

Midship section area 0.515 ft^2
Transverse metacentric height 0.877 ft
Midship coefficient 0.8008
Longitudinal metacentric height 46.789 ft

Lateral area 5.039 ft^2
Longitudinal center of effort 8.683 ft
Vertical center of effort 0.205 ft

I need to know his design goals and why not just build a replica?