I realize Car17 just answered some of this but I'll answer you simply becuase you were talking to me lol. The plexiglas is indeed from Lowes, they will cut it for you into a basic rectangle of whatever dimension u need. I used a jig-saw with the finest toothed blade they make, was like butter I also used a glass scoring tool for the long straight cuts ($3 from lowes, careful not to cut yourself, as I was not so lucky)
I got my U-channel from mnpcttech.com
That stuff is awesome. Hope yours turns out nicely.
Also, this is the tape I used, best stuff there is:
Edited by BIackout - 8/8/12 at 2:32pm