When boatspeed is less than half of the hull speed, the lion's share of drag is due to wetted surface. This is certainly an interesting-looking package. All the photos I have of the 23 seem to show it sailing in a stern-down attitude. Even at the dock, the boat might be stern-heavy. The hulls are shapely and are developed from flat panels, making this design ideal for the home builder.
Plans are available from the builder.
You can also buy this boat in kit form, broken down in four stages from basic hulls, deck and beams kit to completed boat. Pocket cruisers have a great tradition in England and if that's your style, then the X-Kat 23 would be worth considering. Compressible, pocket-cruising cat. Sail Area 247 sq. N. W, Seattle, WA 98107.