Took basically the same route and it went quite easily and provided a very excellent ski descent from the northwest summit down to the basin below at around 6700 feet. Really fun good powder. Of course nobody bothered trying to get up to the true summit - this was a ski trip. Still looked a bit tricky.
Well, the summit is a series of blocky pillars that require some actual climbing. The final, highest block looked to be just a couple feet higher than the one you walk up to on the west side. I did manage to scramble up to the middle pillar, but could not find a decent way up to the highest one. Being winter and all, having no rope or crampons or climbing partner, I decided to play it safe. Great day of snowshoeing in the Bitterroots!
A long trek along the east-west ridge of Downing Mountain on a super-hot day, just about killed me.
But I survived to enjoy some really spectacular views along the way.