In hindsight, I think the bolt heads could have done with being a little smaller but they looked ok when we offered them up!
The outer rings have had the tab washer star shape made. I'm not sure if on the real things, they butt up against the centre cap or are clamped behind the cap but for the model its easier to make them all in one peice like this and then fit the cap over the top.
Here's a picture of Rex Cadmans Panther sprocket which has the centre cap missing which shows the individual locking tabs. The tabs at the 12 o'clock and 2 o'clock position look like they've been clamped as they have a different colour strip along the bottom which looks cleaner than the rest.
The six bolts will have their heads sanded flat to get rid of the modern markings. Also, the holes for the nuts around the edge of the sprocket ring have been drilled out to accept the 3mm nylok nuts suitably cut with three slots to look like a castle nut!
Here's the jig that Howard made up for sawing the bolts, all 64 of them with a junior hacksaw!!! Not a job I shall relish doing again :-/
There wont be much done now for a couple of weeks as Howard is working next weekend and we're both away the week after so dont look for any updates for a couple of weeks :-(