When I went there in 2003, the lovely cup o' tea service had not been introduced and the Macormack family were keeping everyone out!
Back then, nobody had quite realised the Celtic Tiger was walking on quicksand either.
AGW is the only source of P4-profile wheels appropriate for the "S"; Ultrascale has no driving wheels that are close, but they do make an extra-long driving axle (actually intended for outside frame engines) which could be trimmed, as well as lengthened bogie and tender axles. Also, waiting time is now 16 weeks , not eight.
I have a drawer filled with coreless RG4 motors, so will use one on the "S". I am a big fan of bevel-and-spur / contrate-and-pinion drives, so will never use worm gears if I can possibly avoid them.