what E versions of Bf109 will be flyable?

[Crumpp]

I've heard several times that the 109E never had an engine-mounted gun apart from as a problematic prototype that never went into production and that it's just a misconception that's been reprinted since an author in the '60s initially made the mistake of writing it.

The Emil never had an engine mounted cannon. The Ersatzteilliste, Flugzeug-Handbuch, Kennblatt, Ladeplan, nor any other documentation used to operate and maintain the aircraft do not reflect an option for an engine mounted cannon.