more than a few people have built switch panels (or more) for CoD/IL2.
Bodnar boards are quite popular and a good basis for a first project (imho)
http://forum.1cpublishing.eu/showthread.php?t=29958
http://forums.ubi.com/showthread.php...-Thread-Part-2
and here is always worth a look- tho not all specifically for WWII stuff there's always good ideas to 'borrow/modify'
http://simhq.com/forum/ubbthreads.ph..._Builders.html
If this is your first ever build i would recommend trying out how different switch types work with the game interface first before building the 'final' version. (final being probably the wrong word as once you start building it can get addictive
)