Here a photo from the wishbone rig. This rig is a lot more effective than a normal triangle sail normal used with a roll reef. The rig is a lot cheaper because Aluminum tubes can be used. The drawings for the rig are included in the plans
ECO 7.5
As mentioned, the boat is a typical multi-chine plywood construction. The
construction manual shows easy-to-follow instructions on how to set up the
bulkheads. The drawings are DXF files. The important bulkheads are shown to scale
1 : 1. The rudders and dagger board  are easy to build from 4mm plywood, glass fiber, and carbon fiber constructions. The dagger board rudders have an automatic system.
The jump (yes jump) up when the hit an obstacle. Anyone who can work with wood can build this boat. Basic tools for wood work like a jigsaw, a very good sander, hammer etc is all you need. No new trade to learn like building a sandwich boat in vacuum technique.