Ken, it really needs doing and may help organize this library known as the BBS. I think Dave should appoint someone as Moderator (you?) to keep it tidy and on point.
Since Joe volunteered you, I would second that. Hopefully, it wouldn't add time or expense for the host.
Maybe a read only 'craft' archive subforum that links back to the original thread so some potentially huge contributors can visit their favorite areas without getting lectures about placing the thread in the correct forum, and folks might comment or resurrect threads in its original location.
It could be hugely helpful and unique to preserve pictures that tend to fade away. There're nondiy threads that might be included, engraving styles, rare patents, complicated cnc machining, technical comments about unobtanium guns, and tons of etc., etc.
Thanks in advance for your help. Start digging and noting the good threads, others might pm you with threads to save. Later today a five year old picture may be lost. Just kidding Ken, I think it's a good idea, but potentially time consuming to set up, and likely to require maintenance. Huge potential, but it risks being a small 'club' that withers away if there're rules and hoops to jump through.