In 2002, that website released a DVD, "Ralph McQuarrie Illustrator", it's has interviews with him and other insights into his career from working for Boeing, the Apollo space missions and eventually illustrations for movies and books. Hopefully after the website redesign gets further along, maybe the DVD will get rereleased as well.

http://web.archive.org/web/20030204204834/http://www.ralphmcquarrie.com/sign/dvd/cover.JPG

Here's the archive.org's capture of the old DVD webpage annoucement: http://web.archive.org/web/20030204204834/www.ralphmcquarrie.com/sign/dvd/index.html
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