Permanent threads are a great idea!!!!They are, however, permanent, and have the potential to get very very LARGE.
A suggestion for your consideration. Please don't include the list of posters at the beginning of the thread. Also, provide permanent threads in reverse sort. Then the newest information would always appear first. If someone has a slow connection they should also be able to hit the stop loading icon and still see the most recent additions.
Just some ideas.
JAB