Among many other things I've got on the go at the moment (many, many things) is this SER brake, later SR diagram 1553. Variants covered diagrams 1552 to 1557. I needed a brake van that had plausibly been relegated to lesser used branch lines by about 1910, and this one seemed the ideal candidate as they were pretty widespread and numerous. 

CAD progress is good, I have wheels in stock and the other bits needed, so hopefully it'll be a good project. Not looking forward to doing the brake gear, that will be very fiddly (both on CAD and in real life!)