In reply to Southern Man:
Yeah, this is what I was thinking, a very hard, long day walk in from the trail head at Raspberry Flats and then maybe rest up for a day/reccee the first part of the route, go for it on the next day (weather permitting) and then walk out.
So for contingency, allow 5 days? It would all be part of the adventure, so even if not sumitting, it would still be a great few days. How hard is the pull out of the initial valley on the approach from the trailhead? I have heard anything from "rough" to "Diff" standard climbing (with a huge pack!)
How easy is it to get space at the Colin Todd hut, do you speak to a warden/ranger beforehand to get permission or do you just turn up and chance it?