Reaching the base of the Castleabra's West Face is done through Conundrum Hot Springs. From the hot springs, this climb is not that long (Grade II), but if starting at the Conundrum Creek Trailhead, 17 miles must be added, making for a much longer day (Grade III).
The majority of the ascent on the West Face is done on a rather unpleasant scree slope. Even on the scree slope, there are stretches that require finding appropriate handholds so as to not slide down any precious elevation gain.
The scree slope ascends to a saddle with some nasty looking towers that must be negotiated, and then a short climb up the south ridge to reach the summit.
If you descend this route, and are planning (or can afford) to spend the night at Conundrum Hot Springs, you can relax in the recuperative waters of the hot springs.