When I started to make the entrance of the cockpit, I realize that it was not possible to enter the cockpit conveniently. I had to make some kind of j-rails.
Here some pics of the design.
At the moment I cannot upload pics.
So, if interested, have a look at my site.
Here a direct link.
Scroll down to the bottom. Click on the pics for a bigger resolution.
http://home.wanadoo.nl/norbert.bosch/seats.html