O scale standard gauge turntables for 30ft, 48ft, 65ft and 75ft for 7mm/ft scale.
On30 /On3 turntable sizes from tiny 2.5" to monster 16 1/4"
Sn3 turntables (when released) stay available to order. so far 65ft Durango turntable.
HOn3 are only made in batches a few times a year because there is no other way to survive the "ravenous horde"