Progress has been very slow as I had to find some way of fitting the wheels inside the frames while maintaining the back to back gauge and giving some degree of side play to allow the loco to negotiate curves. In the end I had to file the top hat bearings down to almost nothing (not so much on the front axle as I want minimum play behind the cross-head) and then do the same with the insulating bosses on the outer faces of the wheels. It wasn't quite hit and miss as I was able to work out the side play required by drafting it out on Autocad. Next week it's fly cranks, coupling rods and the rest of the valve gear (that in the photo isn't fixed yet - made it up early to check clearances).