Thanks for all your comments, I try to do my best.
To Bigfrit:
These thin sheets of aluminium are used for offset printing. I didn't bought it , a member of my Modeling Club gave it to me. I don't know where you could buy some in Belgium, sorry.
To Flyonthewall:
When the TD is finished, I'll prepare a .pdf tutorial like you did for the intercooler. It will be downloadable from my Modeling Club website.
But the site is not yet begun, I'm better in modeling than in webpages building.
This project takes all my time of club meetings then be patient the end is near, more progress pics soon.
Deedlit