I made it. I decided not to go up powderface, but instead headed to Romulus Backcountry Camp ground. Getting out there was tough. It doesn't look up hill, but it's basically uphill the entire way (duh, going into the mountains).
The last 12km once I hit dirt at Little Elbow was tough. I didn't have much left in the tank and there was about 5 places I had to hike-a-bike in the last 7 km because they were just too steep for me on a loaded touring bike.
I didn't do the whole loop, I will definitely go back to do that at some point, but probably drive to Powderface and park then ride in. I probably could have completed the loop this morning, but I really didn't feel like doing another 400m elevation on double track with a 65lb bike before cycling 90km home.
The highlight was definitely the double track. Getting away from the cars and being basically the only one out there is amazing. And coming down that stuff is so much fun, even on my rigid frame.
I took some video, may try to put a short video together.
Sorry to all you riding northers. 
