Update on the hull building, specifically the bow part. The sides / boards of the bow made of 10mm plywood are bent at a radius of 63 cm! After many tests, I ended up with 5mm deep incisions every 3 cm to allow bending.  After priming with Epidian 601 resin I filled the cuts with thickened resin (with quartz flour)  and attached the still sticky panels on the frame, clamped and stitched. Then came fillets, glass fabric stripes and finally a piece of glass cloths on the entire inside surface. Now my beautiful SCOW-BOW is as strong as a tank! 

Kris, the access door is flush with the surface, so is there already a doubler on the inside to support it over the whole area of the cutout? Where does the upper end of the cutout fall, in relation to the mast partners? It looks from the plans as though there is only the minimum bury, especially on the after mast in the middle of the cockpit, but if you could build higher square boxes to drop the masts into, I wonder whether any extra reinforcement would be needed. Alternatively, a 6 inch tube with 0.125in wall is either absolutely perfect as a sleeve to fit over 146mm, or too tight. I think I'd try to get a short offcut on loan to see whether it fits.

The hull of Carabela 650 is pretty advanced, built from inside - out.   

The aluminum lamp posts are popular and recommended in the JR society. I bought two masts - aluminum lamp post. They are 600 cm tall with 14,6 cm diameter at base. The wall is 4,2mm thick.  Some 60 cm above the base there lower edge of the cutout - gate to make electrical connections, which is a week point.

I think there are at least three ways to make it stronger: weld, put something insite, or glue the edge and wrap few times with glass cloth and soak with epoxy resin. I tend to the last one. 

I think several JRA members already met this issue and the way to cope with is already  practiced. Please advise how to solve this issue.

Great news, Kris! It will be interesting to see how long it takes you to build by this "slot together" method. It's interesting to see that the strongback you're using is made from steel and mounted on castors, as that may be the way that my SibLim 7m design will be set up. The video is labelled 'part 3', but I was unable to track down parts 1 and 2 - do they exist on youtube?

Hi, I'm back to post after some months. The technical documentation of my "JR dream boat" has been completed by the French Naval Architect Jerome Delaunay and is available here  CARABELA650 Plans . Despite cold winter time, that is not favorable to work in a unheated shed, there is noticeable progress in actual boat construction.  Today I put together a movie on present state and uploaded it to YT. My comments are in Polish, but not the video ;) . There are tens or hundreds issues to be solved in front of me, but even more fun. I am permanently digging in the all technical forum posts and JRA Magazines, but will  be discussing also here, asking for an advice.

I've been told, there is in the USA another JR enthusiast who obtained the CARABELA plans and will start the construction.