So recently I came across a set of drawings, after an hour or so on the computer I had it set to two scales and printed out several copies (for personal use only obviously). The OO copy is going to be used to train my CAD skills as I'm going to do it on sketch up for 3D printing. The O gauge copy is going to be used to make one the old fashioned way and that's what I'm doing here (I'm doing a OO one by hand two but OO scratch building is not new to me, O is a whole new world. Anyway, enough waffle here is a photo to get you started. The loco itself is a Stanier 2P 0-4-4 tank