[CHSubZero]

I'm still looking for a three view diagramm so that a plane modeller can "draw" this aircraft.
Meanwhile I found a interesting description of this airplane on Crazy planes.
The linked site discribes the engineering from the prototype C-3600 to the WW2 airplane C-3603 (pics in this thread above) and finally to the last version C-3605 (used until 1987):

Here is an extract of the important facts:

The design of this Swiss aircraft goes back to 1939 when the prototype two seater EKW C-3601 first flew. Fitted with twin fins, the aircraft was powered by a 1000 hp Hispano-Suiza HS-51 12Y piston engine, and was designed for multi purpose roles - including that of fighter, ground attack and light bomber.
...
The all metal design was put into production by the Federal Eidg. KonstruktionsWerkstatte (EKW) aircraft factory at Thun as the C-3603, and was one of the first home designs put into large scale production for the Swiss Air Force. The aircraft was fitted with two machine guns in the wings, plus a rearward facing one operated by hand by the second crew member/observer. Over 150 were delivered to the Swiss Air Force from 1942, being used to patrol Switzerland's neutral air space (along with Swiss Messerschmitt Bf-109's), with six squadrons being equipped during World War Two, the C-3603's served until 1952 when they were replaced by DH Vampire jet fighters.
...

Here is only a two view diagramm from the C-3603:
http://wp.scn.ru/en/ww2/a/142/121/0/4

I also found on airliners.net a picture of the cockpit of a C-3603:
http://www.airliners.net/photo/EKW-C-3603/0431339/L/

Maybe I find a better Three view diagramm instead this on from http://aircombat.modelarji.com/viewtopic.php?t=387: