You are asking for a lot, Joerg. I have seen canoes that large but they were not built in sections. That would make the design much more difficult.
The only advice I can give is use google and the keyword "war canoe".
Also, if you build such a large boat do not take it on the Donau. The current will carry you to Bratislava in about one hour even if you do not want to go there.
Good luck.

: Hi again,
: this community was a stron support when I was building my Pygmy Coho and
: Osprey13.

: Now I'm dreaming to build a hughe open canoe in stitch&glue, but I can't get
: hold on plans.
: My dream boat should be able to accomodate up to 10 (12) adult paddlers for
: day trips. Stability is an issue as I'll use the boat during team building
: sessions - so most of the paddlers will be novices. Some of the sessions
: coul dbe hold at moderately streaming rivers. Conseqently stability is an
: issue.
: For longer trips also speed is a nice thing to have. We'll join the annual
: Vogalonga, a kayaking / rowing event in an arround Venice, Italy. Maybe
: we'll do a month long river trip through Europe (2000km in 8 weeks on
: Danube river).
: For transportation and flexibility, I'd like to have a hull in 3 parts. Bow
: and stern form a smaller version (up to 6 persons)and with the added
: middle section I have all I need

: Unfortunatelly I can't find plans for such a beast. Do you know ready plans
: or how to create some?

: Which Software would be best to create shape, calculate stabiliy, get the
: details of the planks - and much more interesting: How to determin wall
: thickness (plywood + glass layup)

: Best thanks for all your ideas

: Joerg
: Vienna, Austria