Ok rough plan falling together...
Arrive Tokyo Sunday AM, look around TOK Sun - Mon, spend Tuesday travelling up to Nozawa - few stops on the way maybe.
Tuesday night check in and get ready for.....
Wednesday - Thursday hit the snow.
Thursday afternoon back to TOK.
Friday AM check out and train to Kyoto. Fri, Sat look around, head home Sunday night.
Just adding up some ticket prices and comparing to a 5 day JR Pass,