I need to read this one day. I love different, well realised timelines for Trek and sci-fi.As did the Star Trek Spaceflight Chronology by Stan and Fred Goldstein, published by Wallaby/Pocket Books in 1980 as a TMP tie-in. It gave 2048 as first contact for AC, 2065 for Vulcan (on the old timeline of TOS being c. 2210).