Well, I've done it now! That's the holes cut in the dash, apart from the choke that is. The handle fell apart on the old one when I removed it from the old dash so I'll have to get another one. The plastic has all gone grey and seems brittle. Another item added to the shopping list...
Minor alterations to the original layout:
Hazard switch position was raised a little so that it was actually visible.
Switch bank was centred with the bottom flat of the bike clocks rather than the centre of the dash itself.