Got the frame ready to drill / enlarge holes for attaching the servo holder for the 2 rear axles.
For this needed to remove the rear fender, rear wheel and exhaust.
Holes drilled / enlarged
Made a simple bracket/clamp to hold servo.
Installed the servo. (Didn't remove the unneeded attachment point at this moment)
Servo holder bolted to the frame. Might elongate the holes a couple of mm so I can move it a bit more towards the fender.
Also could do with some washers near to the exhaust to bring it more in line. Is a tad off.