Needing to make progress on the C15 locomotive, I decided to get the chassis ready for paint. In 4mm scale this would mean stuffing a couple of wires through to hold the top of the brake hangers.
7mm requires a little more work, the pull rods for the handbrake need to be fitted (OK, we do this in OO too) and there is a whole load of other stuff to go on - but not until I get the wheels in place. At least this designer thinks to provide a slot for the rods to fit, no hanging in mid air and guessing the position here.
The ashpan is a bit more basic. I suppose it does the job but I'd like to have seen a little more construction. Still, it will make a superb ledge for the PCB that the pickups will be attached to.