NEO, Here is a link to page 3 of my 109 build up. I built 2 seperate hatches for switches. The one up front is for the ignition kill switch. It is in the scale location for the oil tank filler on the full size. The rear is for the radio switches and air fill. It is in the rear hatch location on the full size.
http://www.homestead.com/evoshangar/me109page3.html
I also have this same setup on my spitfire:
http://www.homestead.com/evoshangar/spitfireII.html
Evan Q.