Hello Nicolinux,

Some of your surfaces aren't planar so it will be difficult to Shell. I have attached a file where I just created the construction curves and used Boolean and Fillet. All that needs to be done to thicken the outside dimension is to determine how much of a wall thickness you would like and draw the offset curve and Extrude. Hope this helps.

Hi Stefan, are you set up ok now with the file OSTexo posted above? Or do you still need more help?

Please let me know if you are still stuck.

- Michael

Thanks for the help guys,

I think I am fine after I am able to understand what OSTexo did :)
Sorry for beeing such a noob...