The first half of the connections are done -- at least for a first-draft layout, but really once a first draft is finished and working, why would anyone go back and rebuild it all? It requires an improbable streak of masochism to try this kind of thing even once:
http://www.conwaylife.com/forums/viewtopic.php?f=2&t=2865&p=62073#p62073
http://www.conwaylife.com/forums/viewtopic.php?f=2&t=2865&p=62073#p62073