sooo, i have to say i was a bit scared of this project...and as it turns out that was for a good reason.
building stairs is something that is too much for my mathematical capability! although i usually never scetch or plan anything that much, i tried to make a blueprint before i started...of course i missplaced it and figured it all out on the go.
which was good, i found the blueprint later and it has absolutely nothing to do with the endresult :)
i don´t know why and how, but after 30 hours of feeling stupid i ended up with this.