Just spotted this comment for the first time:
Heck, my 109 is the longest and thickest (being 3D!):
Skyraider's 3D Aviation Art - Gallery - Aircraft 6 - Me P 1091a Stufe III
Of course it's waiting for the comment now that it's only a "what if"...
As for stencil placement, maybe ask on the Hyperscale forums. One of them modellers is bound to have some useful kit instructions laying about.