Hello, Mr. Head,
Despite the fact that I scored (or, as they say on AK, "scroed") the (formerly) series 4 speakers from this generous man in Beverly, I would urge you to contact him directly via the email address he provided if you have further questions - - - he was a very good communicator via email, and he just may still have spare parts to dole out.
From my perspective, I have found both CSP and AK to be invaluable resources, but in terms of my own posts, the ratio of my involvement with CSP to AK is probably 30 or 50 to 1. Mostly, this is due to the fact that my primary interest is Acoustic Research products (but also some other NE companies: H.H. Scott, a/d/s, KLH, Advent, EPI, etc.), but further, I generally appreciate the tenor and tone of communication on this forum. Nearly everyone is polite and respectful, and very many members are extremely gracious and helpful with their knowledge and resources. CSP is very different from AK, but each is very good once you specify your interest and determine your audience. My advice: think it out, do some research, become informed, throw it out there, get involved. Hopefully, the web responds.
My own thing: I have a very nice yet modest collection of smaller AR speakers, but I am not yet a member of the big boy club (LST's, 9's, 90's, etc.), nor do I have any sort of background or expertise in audio engineering. Many people on this forum are extremely savvy with lab testing equipment, charted curves, spec numbers and audio speak, and when reading this dialog, once my eyeballs begin to glaze over, I have already gone beyond my pay grade.
To your final question, yes, I do have some spare parts and I do tinker with the internal surgery, and occasionally my mix-n-mash amalgamations venture into the twilight zone, but I do try to learn from the many more knowledgeable voices on this forum before I attempt to create my own Frankenspeaker. Get involved, listen and learn, try your own ideas, have some fun.