Well, there are a small number of flying -109s, and I'm in frequent contact with two German brothers near Munich who are manufacturing brand-new ones. They have so far sold seven, one of them to me. (Kidding, just kidding...) Go to
Metallflugzeugbau Metallbau Flugzeugteile spare parts Me Bf 109 - Hartmair Leichtbau Freising and take a look. It's in German, but there are a lot of photos.
Obviously the manual is for enthusiasts, not to sell seven copies. It's as though Haynes did a 917 "Owner's workshop Manual." A lot of us who have never owned anything bigger than an SC would doubtless buy it.