This is cool, didn't know about it before.
This Japanese page has some information and pictures about cooling the 128/512K Macs:
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.mactechlab.jp%2Foldmac%2F2070.html&sl=ja&tl=en&history_state0=
More info about the MacChimney. Specifically, these are scans from the Second Edition of the Macintosh Bible:

http://www.flickr.com/photos/92704948@N00/275104234
This Japanese page has some information and pictures about cooling the 128/512K Macs:
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&u=http%3A%2F%2Fwww.mactechlab.jp%2Foldmac%2F2070.html&sl=ja&tl=en&history_state0=
More info about the MacChimney. Specifically, these are scans from the Second Edition of the Macintosh Bible:

http://www.flickr.com/photos/92704948@N00/275104234