Roy,
From the photos, the bike has the wrong wheels (both front and rear), wrong float chambers (SU), wrong flywheel (should have a flywheel clutch), non-period twistgrip and levers. Gearbox has been modified (mainshaft drilled for clutch pushrod) and non-standard multiplate clutch fitted. Oil pump not connected to engine (so no certainty that engine runs). Bike has a custom exhaust - original was siamesed. Other odd fittings are wrong due to the non standard wheels.
Personally, I would want to see (and hear) it run before parting with any money.
Hope this helps,
Regards,
Eddie.