Hi Simon,
I've just finishing off a couple of the Campbell's curtain siders in 4mm using the now available Railtec transfers. A couple of observations if I may...
The 3D print is a bit rough and tricky to smooth out due to all the detail therein. I have had some success using Klear keeping each surface flat as it dries, as it's self levelling. At least good enough for me anyway. I appreciate that Shapeways aren't quite the firm they used to be and this is not a criticism of the design or the print per se, just how I dealt with it. I might have had a go with a glass fibre brush but I'd be worried about dishing the panels if I did that.
The transfers are very nice but Steve has only supplied 2 wagon numbers on yellow ovals per wagon, looking at photos there is one on the chassis plate and one on the curtain each side, so you need 4 per wagon. The PVB TOPS panels have numbers for 5 wagons but of those 5, only 7 and 11 were fitted with curtains, the other three (0, 1, 2) were withdrawn still with cupboard doors. Ratcliffe, I think, has the numbers in his softback book on PO wagons. If not, they're in the A5 Cheona book that features the wagon on the back cover. In addition to 7 & 11, 3 and 13 are viable candidates. Not sure from memory on the other 3.
There's a little dark square above the TOPS panel in the pictures I have, I think it might be a faded commuted charge sticker, this is missing from the sheet, but I'm not sure when they ceased to be shown.
Finally, all the TOPS panels are for PVB, but all wagons became PVA sometime before 1990, so for me at least, I'll be patching the panel and putting an A in, it's be nice to have a bit of variety on the sheet.
If you think these comments should be directed to Steve @ Railtec, I'll forward them to him.
That aside, this is the best way to get a model of this wagon and overall I'm pretty chuffed with how it's all come together.
I'll post some pictures once I've got the sealing coat of varnish on.
Thanks,