WW1 bomb aiming sight replication

[jumpinjan]

Researchers & Historians
I'm conducting some research into the allied aiming sights to gather enough information to eventually replicate a working, optical aiming sight.
Here is how one could help:
1) I need documentation on the design and operation of the Wimperis bombsight, and other WW1 bombsights if available. All I have is a single drawing of the Wimperis from the Fisher DH-4 drawings.
2) I also have exterior drawings of the Aldis gunsight as well as its mounting mechanism on the DH-4. Great for modeling purposes, but I'd like to make a working replica. I could use documentation, particularly regarding the optical design.
3) I'd like to find information on the photographic cameras, again with
greatest interest in the DH-4. The Fisher drawings are real iffy in this
regard.
Thanks in advance,
Jan