So I came up with a plan that on the right hand side (#1) would stay the same no matter what. This would keep my control panel the same. I would start with just tracks for engines that matched up with the track spacing for #1. It would be the cheapest and easiest way to start.
If I decided to go with the turntable (sized for Walthers 130' or 90’ table), I would just have to remove the track labeled with #2 and put the turntable in place and curve the tracks to match up with existing track.(Much more costly and I have a chance to see how bad I want that turntable, before putting out the bucks.
This plan gives me a car repair shop and spots for diesel fuel, coal and sand deliveries.
If I go with no turntable the turnout of the yard lead can be used for an incoming north bound engines to hide while being serviced. If I go with the turntable, there would be easy entrance from both the north and south end of the yard.