This site might give you some ideas.
The links on the left side lead to photos and some
Originally Posted by storymitchell
I belong to a vintage BMW club, and recently one of the members was reminising about a buddy that "GSed" a /5 back in the late 70s. Apparently there is a Suzuki dirt bike front end that is a perfect match for a /5 steering head. Has anybody here heard of this? I'm looking for a winter project, and I'm either going chop a /5 or /6, or "GS" one. Any thoughts on the process of GSing a /5 would be greatly appreciated.