Ok...here it goes!
I took the plans from a normal Google search. The drawings are not mine as you may see from the picture itself.
I don't have any copyrights... the picture it's just there in the web... free, no crazy sites no nothing, so i took it! I guess that i'm not doing nothing wrong here.
I don't own any copyright too, so copy them right and have fun!
If you try to google Bessonneau Hanger - pictures, you'll come up with this:
Zoom it and save it.
http://i869.photobucket.com/albums/ab256/TheZabu/bessonneau02.jpg (this second link it's just to have sure that the size of the pictures match, IF NOT take the this second link image)
I'm a braille modeler so this measures are for 1/72 scale... to other scales... well just math to match.
The materials that i used are simple:
3mm balsa plywood (for every main structure and trusses)
1.5 mm balsa plywood (for structural support)
Cianoacrylic glue or any glue for wood
Tracing paper
Paper glue (the white one that you can mix with water)
Ruller
X-ato knife
This type of hanger was 20 x 24 meters.
So let's scale the drawing/picture that you saved. Again, this is for 1/72 scale!
Open the picture in paint (from Windows) and scale it to 365%. The print will be quite fair not losing to much quality.
From here you should have something like 28 x 33.5 cm of 1/72 hanger!
The trusses from the drawings are solid, so i went after this look:


So i traced them first in a paper (you just need one then take copys) and then with some glue i stick them to a 3mm balsa plywood. From here it's all x-ato knife action.
Watch the drawings... plan it your own way... and do it.
When i started to do it i was amazed how good and smooth it went.
I added a little 1.5v lightbolt inside... but i didn't take any "night" picture yet!
Cheers