I'm gradually getting there with my first eight clay wagons especially as I've found more evidence of single V hangers on GWR diagram 013 clay wagons.
On page 54 of 'Great Western Steam in Cornwall' by Bradford Barton there is a photograph of a Pannier Tank 7714 hauling a rake of GWR diagram 013 clay wagons from the Burngullow branch. The first has a double V hanger but the second has a single V hanger with no tie bar. The rest are difficult to make out for certain.
Then on page 91 in the same book there is a photo of Pannier 7709 hauling two clay wagons nearing Fowey. The first wagon has a single V hanger and looks to be a diagram 013. I think the second wagon is a BR diagram 1/51 as it has square ended buffer beams and looks to have a single v hanger but I'm not certain.
In discovering these photographs I'm more confident that there were a number of these GWR wagons refurbished during the 1950s with independent brake gear removed and replaced with standard 4 shoe Morton brake gear. This has encourged me to build four with independent brake gear and four with
standard 4 shoe brake gear, more as a mistake than planed, as I'd installed a couple of brake gear castings the wrong way round.
The wagon front left in the photograph above is the first one which was converted from my EM days and shows the door stop straps in the wrong place. On the others I've scraped off the original mouldings and replaced them with stripes of Evergreen .010 x .030" strip, added small slices of Evergreen .010 x 0.20" strip to represent the bolts. The buffer beams have also had the ends cut at an angle, possibly not that accurate but at least the buffer beams don't have square ends anymore. All eight wagons need door stops, tie bars and couplings adding, plus some lead and then they should then be ready for the paint shop.
Bearing in mind that most of these eight wagons where originally EM gauge wagons, that have been ripped apart and rebuilt, I feel they are coming on nicely. The next challenge will be to achieve the correct finish.