... Templot does the drawing work for you. The usual way to get a full prototypical match is to watch the dimensions showing in the information panel as you adjust the turnout by mouse action, until the desired dimension is obtained. Before that you may need to make some other non-default settings, such as changing to CLM unit angles or changing the blunt nose width. Also it's not unknown for prototype drawings created before the digital age to contain errors, such that it is impossible for two dimensions shown to be reconciled. 2_070542_140000000.png To answer your specific questions: Q1. The "1 /2 point of frog" is called the blunt nose. It is the width of the tip of the vee. In the UK it is not 1/2". For traditional UK bullhead track on non-GWR lines it is 3/4 ", which is the Templot default. This is the very first change you need to make, because it affects other things including the layout of the timbering: 2_071311_170000001.png The "theoretical point" is called ...