RE: BT Bf109E-4
for the 'intake to the mg firing gas' i am making this the location for the radio switch. i will have to enlarge it slightly from scale (1/2" vs. 3/8" scale) to get my fingers in to move the switch but i can live with that. after cutting out the slots (undersize at first) i made some balsa supports that will allow the ply switch plate to be screwed to so i can remove it if necessary.
pic 2: with the ply plate mounted.
pic 3: from the top side. i believe i will cover the ply and balsa inside with plastic and paint flat black to sort of hide the inside.
pic 4: finally, with the engine bay exhausts included which are on the right side only. again, after glassing i will try to remove the 1/4sq. stringer which is in between the gap for the mg firing gas inlet.