Another option would be to model in N-scale if your eyesight and dextarity is good.
I am 70 and model in N-Scale with no issues and will do so as long as I can.
In N-scale you can run big locos and have a 130 ft turntable and with the room you have you could have a great layout.
Not necessarily. A mated AB set of F units needs that much space to turn.
Not really. I have four sets of AB F units and their wheelbase is about 13 inches which works out to just over 94 feet in HO.
That makes a whole lot more sense than tunnels. I guess I asked a stupid question.[:$][D)] The scene should look really good!
If I can make a suggestion, take the bridge pier, tower or bent locations into account before you position the turntable or the approach tracks. You might have to move things around a bit in order to fit the bridge supports in between the lower tracks. I went through a similar exercise when designing my old club’s layout. It took a bit of head scratching even though there wasn’t a turntable involved.
Dave