Drawings / plans
Ron Sands in America made some of the best plans for the Fokker Dreidecker in the seventies. You have to buy them from his son, also Ron Sands in America and by law, you can built ONE Dreidecker with on set of plans. But they are very good and very detailed.
The plan set comtains 25 sheets of paper, size A0 (92cm x 61 cm).
The structure and plans are as close as they were in 1917 when it was constructed. Just for a few necessary small changes it will be the same setup, wood and metal material as almost 100 years ago.
Tha is how the wooden spar looks like from the inside
Spar building device / jig
Spars in detail