I used one for OBA with the top mounts. I used the stock top mount bracket, cut the rubber ac line and added a filter to it for the inlet. On the outlet side I removed the rubber ac line and modified the little male fitting to accept a connection to the copperline I used before entering into the...
http://www.gov.nt.ca/Transportation/hwyinfo/hwymap.htm
Tuktoyaktuk, NWT is a little more doable for us without huge budgets. Not a lot of actual wheeling, but you get to take ice highways, etc. in the winter. A group of us are most likely going to try it in Jan/Feb.
I saw the olympic cage at the vendor show during easter jeep the year past last. It wasn't very impressive. They used pretty thin wall tubing and I could literally push the cage against the body in sections. The c-rok looks like a good one if you don't have the skills to fab your own.
Any updates yet on what is going to be run and when? We are a group of 3 XJ's and one YJ from Vancouver BC and will be down there on the 19th to the 26th. We'd be interested in tagging along.