Telescope with an F1 (!) primary, built by our professional cousins.....
Not exactly relevant, but it illustrates the truly Massive ongoing efforts by professional astronomers to make extremely large telescopes as compact as possible. The point has been reached where gigantic professional telescopes are virtually "no longer than they are wide", to put this trend in homely layman's language.
I feel that the amateur community should try to adopt the same aim of "compactisation" for our much more modest instruments.
( Its the Large Synoptic Survey Telescope, though recently having undergone some name changes.)