Hello Valio,
I have been watching your thread here and don't see any responses so far. I am also working on a design to make a 5th axis head for my next CNC build. I started with a basic rectangular shape for the head but would really like to do something more like the Tri-Tech design with a more streamlined appearance.
Maybe it will be good to start with the simple shape and then try to improve on it after it is done and I have a working prototype? Have you done anything with your design or started build it yet? If I get started on mine I will post pictures and details as I go with the build. Here is a snip of what I have drawn so far:
Regards,