I'd take a different tack, possibly two. At the moment I guess that the 1/32 market is quite small (in comparison to most of the other scales) so something that may appeal to more mainstream tastes might only get a couple more sales. I'd go for something so ****ing drop dead gorgeous that no wallet would be safe; not many 0-6-0 tanks would fall into this bracket, though I do know of a single that just might. Which brings me on to another thought, that if the committed 1/32 modeller is a bit thin on the ground, then perhaps there are more sales to be had among those who may have designs on a large scale trophy piece to plonk on the mantelpiece. Perhaps the market to tap into isn't a 1/32 group with disparate interests but the Caledonian Railway Association or the Cumbrian Railways Association where at least there is interest in a common prototype. With a little luck and some goodwill the historical research may be gifted to the project, or at least eased.