I am the ultimate geek, I have an scanning electron microscope in my living room and a cnc machine shop in my garage.
Retrofit of a 1986 Hercus CNC Lathe http://hackaday.com/2009/12/28/industrial-cnc-controller-retrofit/
Conversion of a Pentax k10d to infrared by removing hot filter from sensor and replacing it with a glass IR pass filter. http://hackaday.com/2011/04/22/dslr-infrared-camera-conversion/
Construction of a laser cutter from stuff that was never intended to be a laser cutter http://hackaday.com/2012/08/31/diy-laser-cutter-from-non-diy-parts/
Rebuild of a 1942 Monarch 10EE lathe, arguably the best tool room lathe ever built. http://hackaday.com/2012/05/28/turning-a-1942-lathe-into-a-functional-piece-of-art/#comments
Links to the first retrofit of my CNC mill and servo retrofit on my Monarch Lathe http://hackaday.com/2010/01/01/more-cnc-goodness/