I locally found a 04 CR250 frame along with a 04 YZ250 set of forks and turned to fleabay for a front GS frame so I could still ride the pig while working on the project.
As of today, the frames are cut and ready to begin the welding phase.
Since the pegs where still on the CR frame, I had no reason not to upgrade the vintage items that came stock on the GS
My TIG welding friend will come pick the frame parts in a day or two and I'm looking around for a 21 from a 20mm axle KTM as the hub on theses can be fitted with big single rotors from the 640 adventure.
YZ fork awaiting their new life: