Well, I got the new bungees installed on my Kitfox IV-1050 last night. It took about 2-1/2 hours to do. Not too terrible of a job, but definitely a two person situation. Dave Fisher posted a photo on the Rotax Board of a technique using an ax handle to wedge each wrap while making the next.

I did similar and used a scrap piece of 1 x 2" wood. I trimmed it down to a bout a 1 x 1, then made two angle cuts in the end to make the two way wedge. Without this tool, I'd have no idea how someone would do this task. If I had to do it again, I think I'd be down to maybe an hour, total. (I'll try to remember to get a photo of my Bungee-Stick next time I get to the airport...)

Not an impossible task, just a PITA.