I dont like to be too negative about something that has been generously offered FOC but I have to agree with others here that this design seems to be a bit heavy. The website says that 1/4" plywood is used for all parts of this boat so as to keep to one thickness for all components. I think it is usually a mistake to limit a design in that way, materials should be selected to suit the requirements of each individual part.
As a first guess, and without having done any analysis, I would imagine that most of the sheet material for this boat could be 4mm marine plywood. Parts such as the cockpit sides and the vertical web between the bottom and the floor could be even thinner. If there is one part where thicker ply might be justified it would be the floor - an adult jumping into the boat could cause higher local stresses than any normal sailing loads. Using thinner plywood would bring the weight more in line with other small plywood boats such as the Mirror dinghy.
I think the website suggests using a windsurfer mast. I am also a bit sceptical about that. A windsurfer mast used in this way is cantilevered from near the lower end, whereas it has been designed to be simply supported at the lower end and at about one third height. Add to that an adult hiking out really hard on this boat could produce more righting moment than the same person could produce windsurfing, so there would seem to be the potential to overload the mast producing a poor sail shape and/or breakage. With two adults both sitting out it I am sure it would be possible to overload the mast in strong winds.
Re the slab sides - fine if this is intended to be a stable boat to inspire confidence for beginners, but not so good if it is intended to perform well, especially in light winds.
The reverse shear is not a bad idea, it gives extra freeboard amidships which could be useful when the boat is heeled. I think the bow profile is pure styling, some will like it some not. I think it fits in quite well with the general appearance of the rest of the boat.
Good to see someone bypassing expensive designers!