Yesterday was just one of those days. A little progress with the Jubillee but a series of set-backs, sufficient to make me want a few days away from it!
The progress was in successfully cutting back the rear edge of the cab footplate to clear the front of the tender, fitting the fall plates and some guide pins that hold the pivoted tender doors in place whilst allowing movement on curves. I also fitted the whistle to the cab front, although that bit leads into one of the set-backs.

In anticipation of the painting and weathering of the loco, I have been refreshing my memory of the necessary assembly sequence and found that the motor must be attached to the gearbox before fitting through the footplate/cab, then the motor wiring attached and finally, the boiler fitted over the motor, plugged into the cab front and fixed to the smokebox saddle from underneath. I also needed to find a suitable space for the DCC chip - not easy as the resin boiler is packed with lead sheet to give tractive weight and balance on the locomotive springs.
I had dallied with connecting the motor up for DC operation initially and fitting the chip later. However, I decided to fit the chip straight away as I have had the loco running successfully on DC previously. In the end, I was quite pleased with the motor/chip installation, although the soldering wasn't my best after struggling with bits coming adrift when I added the next wire. These photos show the arrangement without the boiler. The tender is not coupled in the first shot and fits closer to the loco than illustrated.

The first set-back came when I tried to programme the chip with its proper address (5701) which involves first setting CV29 to accept four digit addresses. On doing this, after swatting up from the various instruction manuals, I got an error message. Furthermore, the chip appears to be totally unresponsive despite trying both the new address and the factory default address of 03. Now I'm not sure if there's a chip fault - nether had any previous trouble with the Digitrax DZ123 type, before, or if the problem lies in my Lentz DCC control unit or throttle. Further checking of wiring, etc., is in order before I rip the chip out.
The second set-back resulted from fitting the whistle as this now prevents fitting of the boiler till I've ground away loads more of the inside of the firebox. Previously, the boiler just squeezed over the motor with the back end clear of the cab front. Now, with the whistle protruding from the cab, the boiler has to be about six or seven millimeters further forward, to clear the end of the whistle and the thinned down firebox sides no longer coincide with the motor body. Oh well, out with the rotary burr.
The final set-back was the disintegration of my illuminated magnifying glass that I need to see what I'm doing. The mazac castings that grip the lens/light unit broke, causing the lens to fall down, suspended only by the power cable, luckily without hitting anything but effectively ending any use of the unit. A smaller, cheaper replacement has been ordered but will take a week or so to arrive. I do have an Optivisor head set, but find it hard to get on with and also a lack of bright illumination to see the detail in my modelling room.

Hopefully, all these issues will prove no too difficult to overcome, in the end.

Dave.