No.1,
Well done mate!!
I haven't seen any WIP about Eduard's Bf-109E, I see a big problem with engine as you comment. This is one important point to model maker and aftermarket producer, they make many detail on scale and don't take care about all concept "In scale". So, plastic thickness is not the same as metal sheet............
But the point is, you make a very nice Bf-109E share it with us. I have this kit (ok, ok, I have Royal Class) and it will help me a lot when I built them!!
Thanks,