As the layout is run by DCC then it makes sense to have the turntable controlled in the same way.
I have a ZTC255 chip spare that has a 2Amp capacity so that is ample for running the turntable.
First off, though, I did a lash up to make sure everything worked. Remembering the mantra - red and black to the track, orange and grey go away, I soldered up the motor leads to the orange and grey (remembering to put some heat shrink over the wires first. Then I connected the red and black to some wander leads to get the power in. As you can see from the video, it worked!
The chip is addressed as 99 to keep it clear from the loco chips I have running.
Needless to say, there is lots that still needs doing - like setting the turntable into the baseboard etc. but, hey , this is more fun!