Over the period of a few years, with one previous version, the input from several friends (mainly Boris and Wolfgang) and some good luck this sailing rig finally materialized the way it is described in detail hereafter.
The bungee line (8mm) keeps the rudder fin up. Without it the fin would just fall down by force of gravity. The 2nd clam cleat is not really necessary. You could also tie one end of the white/green line onto the shackle. But to get the line out of the way when undoing the spray cover you need one clam cleat.
Thwart holding the mast in position.
Socket for mast.
Mounted onto the operational thwart close to the cockpit.
Upper and lower pivot point.
Chafing of the Klepper appliance. After many trips about the only tear and wear.
Klepper appliance with homemade attachment. The screw head on the right is the same as seen in the next 2 pictures.
Holds the Klepper appliance.
Attachment holding the Klepper appliance.
Lower pivot point.
I found it worthwhile to have it sewn by a professional sail maker. He incorporated a camber of sail to allow the sail to shape like an airplane wing when the wind is right.
Red one is the main sheet. Green to tighten or loosen the sail alongside the boom.
Gaffel (blue) and boom folded up.
The Ally gunnels (AD 16 mm + ID 13.7 mm) used as the boom is not rigid enough in strong winds. A 70 cm sleeve (AD 19.5 mm + ID 16.6 mm) will reinforce things sufficiently - if positioned properly, like closer to the mast.
Thwart with slots for the hose clamps.
Thwart attached to frame with hose clamps.
I use new clamps on each trip.
You need to cut the skin for the hose clamps.
I doubled up the area with a PVC patch.
Thwart holding the mast from below.
Socket for the mast assembled.
Small hose clamp to keep the socket in place. There is one on the other side also.
Providing more surface area for the mast to rest upon. The rod itself would not be a lot.