Some interesting 2001 release versions info in this thread -- don't worry, only 3 pages this time:
Cinerama 70mm 2001 preservation. Is it possible?
http://originaltrilogy.com/forum/topic.cfm/Cinerama-70mm-2001-preservation-Is-it-possible/topic/15358/
and of particular note is this referenced article:
The Big Picture: 2001 on Video by Thomas E. Brown
http://www.visual-memory.co.uk/amk/doc/brown2.html
which suggests that the final MGM release (with better detail from 65mm film-to-tape):
The MGM CAV 3-disc 25th Anniversary Laserdisc set (1993)
http://www.lddb.com/laserdisc/04985/ML103104/2001:-A-Space-Odyssey:-25th-Anniversary-%281968%29
may be useful with the Criterion release (Kubrick color correction from 35mm scope) for a merged-version -- like my Disney's Zorro two-source YouTube-color/TV-luminance proof-of-concept: