Whilst the main concentration has been on the size you can machine, the boiler should also be given some thought. A round topped parallel boiler is MUCH easier to construct than a belpair taper boiler. Even if you are wealthy enough to buy it, the latter type of boiler will cost a great deal more. As for backhead fittings, you CAn make them closer to scale than LBSC did, it all depends upon how much work you want to put in. Similarly, you can add scale features and make it more true to life, if you so wish. At the same time, the prime purpose of a steam loco is to that it should run. If you built one as per the "words and music", you could always add finishing details at a later date, and could also make scale backhead fittings at your leisure. Alan ----- Original Message ----- From: "Jem Harrison" <Jem.Harrison@xxxxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Thursday, September 29, 2005 1:51 PM Subject: [modeleng] Re: [modeleng] Re: 3½ versus 5 Rich, Bear in mind that I am coming into model engineering from a background of building models in 7mm and 10mm to the foot, in which I tried to get the details as near to scale size as the Mark 1 eyeball could achieve. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.