Thanks for the response Northroader- when I saw your loco I did think of the little Kirtley well tanks and whilst they are truly delightful I think your chosen prototype really interesting- and, as you say, less likely to be the subject of criticism- anything from Derby, Swindon or Crewe is so well documented. The NBR loco you illustrate seems very familiar- much the sort of thing that I hope to build, although I have considerable freedom, being CME of a completely freelance railway. My loco rather controlled by the Slaters 7'4" x 7'8" coupling rods, which dictate the wheelbase, so possibly a bit bigger than the Kirtley. The Rhymney had some quite big saddle tanks with double frames and 4'3" wheels- and I rather want to capture the ambience of one of these, albeit with a tender- a certain brutish solidity to them. I did look at having a raised firebox and longer chimney etc, which would certainly have been appropriate- and a bit Furness or Cambrian Sharpie in aspect- but seemed a bit effete somehow, so the chimney, dome and firebox front which I'd bought from Laurie Griffin will go on a Beyer Peacock single (one day) and I'm substituting the SER Kits 01 boiler, which I hope will give the feeling of massiveness that these beasts seem to have. Maybe one day some new build group will re-create a full sized double framed six coupled goods- it would fill a noticeable gap - apart from half a loco chassis in the Armley Mills museum they seem to be pretty much extinct!