I just finished my DIY strip cutter. The instructions can be purchased at the link below and a short video is available to watch it work.
http://fusedglass.org/stripcutter The instructions cost $15 and about $45 in parts all available from Lowes and Home Depot. I had to go to both to find all the parts. I made a few modifications to their instructions but not many and all minor. I added the metal strips on each end just to protect the ends of the ceiling tile. It works very well.