I just completed kitbashing an Atlas TT to a 90’ turntable. I was fortunate to have a neighbor’s excellent help - the kitbashing was done with wood and a 5/8" solid copper pipe to raise and support the new bridge from the Atlas TT. I used a 12" cake pan for the pit - it came out quite nicely. After assembling the modified TT I cautiously tried turning the bridge and then tried power to the TT track - voila, everything worked.
It was necessary to take the track apart from the TT base which required some care to avoid losing the small pieces and springs that are required to power the track.
If I can determine how to send pictures of this kitbash I will do so.