although not a WWI aircraft theme I hope you find interesting an attempt to repeat Czechoslovak 1923 record flown recently by Avia BH-5 replica joined by replica of earlier BH-1 from Prague to Brussels. I have to underline it's actually happening - planes left Prague on Saturday to reach Brussels on Tuesday. Most recent info can be found at Flight to Brussels and info on replicas at AVIA BH-1 replika letounu z roku 1920
Many thanks in advance for your support by crossing fingers for Avias,
Miroslav