Cairngorm
No lift served terrain at present. (Apart from a trial using the choo choo. IIRC this involved the mandatory hiring of CM gear, being guided and largely used a Piste Basher track to descend)
Nevis Range
Gondola serves WC DH course and Nevis Red. Circa 2000ft vertical. Quite good /enough to keep you entertained for a day.
Coe
Chairlift serves DH course and a Red. DH is fairly natural / full on, the Red is much easier / littered with man made features (berms drop offs etc) Circa 1000ft vertical. Not ridden either.
Glenshee
Charlift serves one course I guesstimate 750ft vertical. Was up a few weeks ago (under my own steam) Could best be described as a work in progress / low cost first effort. It didn’t look like anyone had been riding it recently, berms littered with brick sized rocks.
Lecht
Chairlift serves one or possibly two courses. Cant be much vertical – 500ft max I reckon. Info available on their website / Youtube.
Don’t like to diss these places but it’s a bit of a mixed bag and I reckon you’d come away disappointed with a lift served road trip. Coe and Nevis combined with some natural stuff in between would make a good long weekend tho.