... the turnouts in a string along the inner or outer road. If the string configuration is laid along the running line, it has an advantage for model control in that to select a road only one turnout needs to be reversed, the rest being reset normal. So a simple rotary switch is sufficient. For a tree configuration a logic matrix of some sort is needed. Next is to lay out the siding alignments with sufficient spacing for running clearance, and for a fiddle yard with additional clearance for handling the rolling stock. 2_080850_260000000.png You have indicated a string design, so I continued with that. Create a branch track on each turnout, convert it to a simple link to the next road. Check the resulting radius. If ok insert the next turnout in it and repeat, otherwise go back and use a longer crossing angle on the previous turnout. You started with a B-8 generic. I kept the generic crossings, but lengthened the turnouts to C-8.5 to keep above your radius limit. Here's a quick video clip of that ...