OK Jerry here is the BD4 version. I like the rear
beam better. Also I added shims so the downthrust
angle can be adjusted.
-- 
Paul Lamar ...No rotor no motor.

Paul,  can you tell me the over length of the rear beam measured
along its center line?   I think I can get it out of a 4 foot length
but not sure.  I want to order steel today if possible.    Jerry

Sure here it is.