Hi Jim,
this is nothing sophisticated. I created it out of the situation. At my hardware store I bought a chipboard and two stands to have a work bench for constructing a lefthand and righthand switch. First, a straight track was put on the chipboard and the rails were marked. Then a bent track was overlaid and marked, too. Further more, I made holes along the rails and inserted dowels to fix the rails. Now I could position the ties under the rails and weld them together.
I started with a righthand switch. After that, the dowels were punched through. When the chipboard was turned upside down, I had the template for the lefthand switch.
The template for the straight track was constructed on the fly with angle iron. To support the template two U-shaped profile irons were positioned on the two blue stands to have a comfortable stable construction for welding the rails on the ties. That´s all.
To construct a bent track of any radius it is very easy. First, one rail is welded to the ties with the help of the template. The second rail is welded to the utmost right tie, only. Now the construction is removed from the template and bent by hand. The trick is, that the inner rail is shorter than the outer one, depending upon the radius. As you can see in one of the supplied pictures, I used a 90 degree double vise to fix the second rail. Now it could be welded to the ties.
I hope, I could explain it in an understandable way in English. Please, don´t hesitate to ask for more explanation, if it is unclear. I will try to do my best. As an retired engineer, I am not used to communicate in English any more.
Best Regards