Thanks for all the nice feedback.
TEST OF GLUE
Thanks for the great tips from SOS members.
I only found one brand here in norway 3M but not the same type.
PRITT paper glue and 3M spray glue.
The material is birch for both, the front and rear frame.
Then just try to see how well the pattern are attatch to the wood.
A little scraping with a sharp knife blade and the winner is the PRITT, bekase the pattern sitts well placed at the edges and is easy to scratch,
does not leave any residue, something 3M did not.
GET is also the cheapest about 2 DOLLAR.
For mounting the parts I will try CASCOL INDOOR which several of my Norwegian model building friends use.
Later we get an answer to that.