Having got to the point where all 3 chassis' are fitted together with the tabs, I thought it was worthwhile to get one of them running before I soldered them together, If it didn't run, taking it apart again would be relatively easy .
I need not have worried, the chassis ran perfectly under finger power at the first attempt, as you can see in the attached video. The chassis is only held together by the tabs.
The other 2 chassis' have therefore been soldered together, the tabs removed and the overlays added.
The kit supplies 1.5mm rivets to secure the coupling rod joints, these are just not appropriate and are far too long, I have used some 12BA nuts and bolts for now but I will need to make up something a bit more accurate later.
If you are using the MOK wheels crankpin "nuts" are supplied for the leading 3 axles, but the rear 2 axles are tapped 12 BA.