You picked a good plan for Rainier. It’s a slightly compressed version of the 24 week plan which has helped hundreds of mountaineers succeed. It gives up some weeks in the longer progressions we like to see but it will still be a great one for a two day climb like Rainier. That peak was really what we were targeting when we developed that plan. I would not change a thing, especially the first time through. Next time you use it you will be wiser about who your body responds and what you need more or less of and then make some adjustments.