You're right there are many iconic threads and posts, but I doubt it's necessary to create a new board tbh. The threads will do, I guess.
However, if you're interesting in the history of Bitcoin and the forum, why don't you create detailed and comprehensive thread/linklist which features the most important milestones/threads/posts of the forum. Other users would surely help you with that.
While there are various threads that already link other historic posts and threads, to my knowledge, however, they are not comprehensive and/or are not regularly updated.
A good start would be xtraelv's historic and educational topics, which @GazetaBitcoin linked already.