The MTH Premier PS2 N&W J measures just under 24 1/2" wheelbase using the drawbars longest setting. I did not measure the shortest setting, probably an 1/8th" shorter.
Wheelbase for my Lionel TMCC N&W J measures 24 3/8th & my Legacy N&W J measures 24 1/8th.
I don't own the turntable, but I'd think even if the wheel base just fit, the pilot & tender coupler hitting those blocks around the perimeter of the TT would be an issue. I guess the real test is for someone to actually try it.