I think the inside layout speaks for it self. The master berth room is at the place with the lowest movement. It is a sort of split level design. The feeling on the saloon implies a much bigger boat with a full view from side to side over the roof of the master berth room. The kitchen in the port hull has also a lower movement as a kitchen on the bridge deck. So working in the kitchen is more safe to.  Personal I the detest the usual kitchen in the saloon. You will find no bigger bathroom in any other design of this size. The clear split from living area, kitchen and bathroom ensures a pleasant stay on the boat also for a long time. The enclosed cockpit enhances the safety on board and will be special appreciated with small children on board. The of center dagger board rudders make room for steps to the water surface. The center mounted board is an other safety feature. The draft of the boat fully loaded is only 0,40m! So you can enter coves no other boat of this size can reach.
In a self build boat, the rig will cost more as the material of the whole boat.  My solution will help to get these costs significant down. As mast a glass fiber flag pole is used as base. In combination with the vertical furler without a profile the cost will split in half. I use a double sided sprit as boom (wishbone). In this way, the main sail can be set lower which brings the center of pressure down to. This makes the boat a lot more stable.  The jib is a self tending jib and genoa (or flat cut genacker) is equipped with a furler. Again without a profile. The main and genoa have a sleeve which can be opened with a zipper. We used zippers on our PELICAN for 11 years without any problems. This will not only keep the weight down but also the costs.
The boat will be very fast the speed prediction shows for instance a speed of 10 knots in wind force 4. The boat can reach a speed of above 20 knots, which is not interesting for a family boat anyway. The study plans show the speed prediction as a graphical as well as the dynamic stability. The windage of the boat is a lot lower as comparable catamarans. So sailing to windward, also with shortened sails, will be a lot better. This is the reason why I advise to use only two 10 HP outboard engines as auxiliary drives. No smelly and expensive inboard engines!
Interested! For the begin order a study plan (study plan costs are refunded when the plan is ordered), with an example drawing, speed prediction and dynamic stability diagram for different wind speeds. The list of drawings (35) and a list of materials, so you can calculate the costs for the materials.

L.o.a.                       10,00 m ex. rudder
Beam c/c                      5,00 m          
Beam                          6,22 m          
Draft hulls loaded            0,39 m          
Draft dagger board            1,70 m          
Main sail                    30,00 m         
Jib                          13,50 m         
Genoa                        40,00 m         
Weight empty               2000    kg         
Weight max.(CWL)           4200    kg         
Engine: outboard 2x          10    hp         
Construction time approx. 2000 hours*         
* will be differend for ever builder           
Copyright     2016/18  by B. Kohler
      All rights reserved
Study plan                  
18 pages, 15 drawings     and pictures, description, list of materials, list of      drawings.                      
US $ 20,00                    
The plans are delivered     as E-book with building     instruction and 36            drawings DXF format        plans cost:                   
US $ 1700,-                   
Background image, PELICAN in a cove in August near Ibica/Spain