Will this work?

I ran my first trail 50k about a month ago. It was a rough and rocky trail with about 5600 vertical feet of climbing and descent. It is the longest run, I've ever done to this point. I felt tired at the end, but never hit the wall and ultimately felt good throughout and finished feeling like I could keep going. It took me 6 hours and 54 minutes. I was back to my normal training routine within three days. I run about 40-55 miles/week with once a week long runs of about 2.5 hours on trail with a few good hills. Once a month I've been doing 4-5 hour runs.
I'm now hoping to run the Katcina Mosa 100k in August. I'm hoping to gradually increase my average week to 50-65 miles, but mainly build my once a month very long runs in order to be able to finish. I'm hoping to do runs of approximately the following lengths. February - 30 miles, March - 33, April - 36, May - 40, June - 17.5 mile race (Wahsatch Steeplechase), July - 45.
I'll try to do all of these as difficult hilly trail runs. My question is does this plan look workable to you experienced ultrarunners? How would you modify it to finish Katcina Mosa?
I'm not trying to win, but would like to become a regular face at intermountain trail ultras over the next few years. Any advice would be helpful.

Excellent question - the type of topic I hope to see discussed here, for everyone's benefit, including mine. I'm not qualified to give specific advice on that distance, but I've heard from some other runners that the Katcina Mosa is much harder (mile-for-mile) than its sister race, the Squaw Peak 50. Something about the steepness, maybe the heat. But as you can see on the trail race page, the feet-per-mile gain is actually more for Squaw Peak. So who knows. This is just heresay, and any given opinion depends on how your body decides to react a particular race.

Anyway - I hope some of you more experienced ultra runners will lend some specific advice here.

sgdesertrat, I don't know anything about that particular race, but I think your plan should be plenty good enough, depending on your goals.

I prepared for Miwok 100k last year with about three 50k races and that was sufficient. The course has about 10'000 feet of elevation gain and it took me a little over 15 hours to finish. Not great, but my goal was to finish. I also think you have plenty of time to get ready, so depending on your goals I would stick with that plan and make sure you don't get injured.

You may also want to look at the January (or February?) copy of Runner's World. It has a sample of Tim Tietmeyer's training log for one year. I thought it was interesting to see how he prepared for Western States! Good luck!

Thanks Marcel,
I actually picked up that RW just for the Twietmeyer interview. That sounds like a great finish to me. Like you, I'll be happy just to cross the line. It's funny you should mention getting injured as I'm injured right now and have missed the last week of running. I think it's not serious though and hopefully I'll be over it soon.