I attempted it last weekend on the 8th and had a blast in the rain and wind. We weren't able to do the summit block with brutal winds and rain, but I did try to find a way around the blowdown on the way down the mountain. I followed some other foot prints in the snow for a while but then headed due west after I thought they were going too far north. Once I got back below the clouds and could see something I realized that I was north of the Pt. 5794 near hwy 138 along what must have been Porcupine Creek. I then headed southwest to get closer to the trailhead and promptly found myself in a lot of blowdown again before coming out onto the road a quarter mile north of the trailhead.
So the moral of my story is that if you wanted to hike a mile down the road you might be able to avoid the blow down to the north, but I think you might have better luck going along the Camp Creek to the south (just speculation).
Congrats on making it David, I hope to get back sometime on a day like you had.
Here are my pictures (with two good ones of blow downs): http://picasaweb.google.com/cdweiland/SoOregonDay4MtThielsenAndDriveHome