Building a 3pt offser disc harrow?

[porkchop401]

Years ago while in high school agriculture class built a single offset disc to go behind my dads Yanmar 220. I made it from 2 gangs with 4 blades each and a channel iron frame. I still have it and used it with my Yanmar 226 . To the question....has anybody made a offset 3pt disc harrow by using wings from a fold up large disc say 21 footer that the wings or five or 6 ft 7-8 blade per gang?
I will pulling it behind a 40hp full size tractor.