Seeing how a RTR manufacturer would tackle the issue of the front bogie/cylinder interface whilst still allowing operation round fairly small radius track would be interesting,for sure. BUT, if it can be done then it would open the door for NER Atlantics, A7 and A8 tanks, the 4-8-0Ts or even Raven's big beastie - his Pacific. The last is, I would be the first to admit, probably a step too far, but never say never...
Certainly a B16 would be a good choice for many - they were long-lived, were used on many varieties of trains, could be seen all over the old NER routes and occasionally further afield. Oh, and to many they could be regarded as a 'big chuffer'