I have recently purchased an old Sir Dinadan model, it needs a bit of work as I am going to change it into Stewart Lanes' finest, 'Sir Dodinas Le Savage'. However, the driving wheels back to back is about 1mm less than it should be. easy enough to alter but as the B12 uses the same chassis block i wonder if I can use a B12 chassis block, one of the China versions, under the N15, not obviously the current B12 by the way! Any thoughts anyone? Why not just buy a modern Arthur? price chaps!