I know what you mean with the scale growing on you. It happened to me with the cockpit.
With so little time available for me to build, I have to settle for more "practical" approach of what is "enough scale".
Truth is, that I choose your ME-109 because it was the only one I found which had the correct landing gear stance. Visually it looked correct while other ARF's and kits do not, trying to "cheat" with the landing gear.
My ME-109 was always intended to be a general flying scale aeroplane ("sport scale"), which I will take to the airfield often, and not a "show queen". I just never envisaged it will take me so long to build :-)
Your muffler is awesome. You will obviously provide it as an optional accessory with the kit? (just kidding)
Is the engine a DLE55RA?
Eran