I have started scratch building a Sharp Stewart Cambrian 440 which will be in EM gauge and hopefully powered by a portescap motor on a split chassis. The choice of material is nickel silver (NS103-half-hard) as I believe this is superior to brass when it comes to scratch building. Tufnol rod will be used to make top hat bearings to isolate the driving axle from the motor and pcb board for the split chassis. 3D printing technology will play a part in the construction of the loco and will be employed in areas that will benefit from it. As I progress with the loco I will post photos of the parts I have made with details of materials, construction methods and tools used. I expect there will be a few errors made along the way and the involvement of some experimentation which I will be happy to share with my readers.