My primary interest is the GWR (1930s), but I have taken the view that both LMS and SR wagons are likely to be visitors to the area my layout will be based upon. So, given that these are common carrier wagons, I've ordered three of these LMS wagons. Assuming some more are available later, I will probably order two or three of them too! Not part of this thread, but when I ordered some of Rapido's PO wagons from the 1907 RCH range, I did try to pick ones that would be likely to be seen in my planned layout's area. They all look like great models and are relevant to my area, so I ordered them!
I hope the LMS DIa. 1666 wagons prove to be a great success!
I agree that when quality multi-colour 3D printers become mainstream we shall see an explosion of wagon models being 3d printed. No more "why aren't they producing diagram xyz... that's what I need for my layout...