Hello again!
Noone seems to have anything relating to the blueprints for the Bf-109 E-3, but I have managed to dig up something interesting myself.
This link:
http://me-109.br.sites.uol.com.br/maine.htm takes you to a homepage, where a brazilian is making a replica of a Bf-109 G-2. He has acquired the blueprints for the plane from the Flugzeug-Union Süd, which is the preservation institute for Messerschmitt (now know as EADS).
Link to Flugzeug-Union Süd:
http://www.fus-online.de/firmenporteng.html
I have written to this institute and hope to get some respons.
Thanks for reading
Regards Henrik F.