OK - progress of a sort
Frame and forks delivered at Stotford engineering for the necessary fettling to be carried out.
They are going to use the standard T140 head bearings and adapt them to fit the KTM forks, then modify the frame to fit the new KTM bearings (if that makes sense).
They are to de-tab the frame and make me an underseat battery/electrickery box much like GS had, but as I'm going keyless there should be no need for external locks.
I left them to ponder where best to place the footpegs and brake pedal. I've sent him all the photos I have of the GS bike as a kind of blueprint, so time will tell....
Now to the rest of the stuff needed for the bike (wheels are back soon-ish) so I'm speccing and acquiring handlebars and controls, lights and speedo at present.
Cheers