Hello Aquilius,
You are right. The problem is that I have information only about Harlan monoplane itself, that is - on the original design of 1911. Of course, I realized that the fuselage of early model of the aircraft was not covered. However, this was the only difference that I could see.
The main source about the airplane, which I used is here.
BRISTOL Pre WW I Period TUAF AIRCRAFTS 1 nci dunya savasi oncesi Turk HvKK UCAKLARI
As to Nationale Flugwoche in 1911, I was suggested by the press release. Pay attention to the note entitled
The Johannisthal Meeting.
voisin canard | 1911 | 0898 | Flight Archive
My Mom always said:
DO NOT BELIEVE JOURNALISTS.They always overstate the facts.

:
Greetings
Marek