Version 3, 8/14/10 This version has completely redesigned supports to help it look more accurate. Other than that, I dusted the sentry off a little. Download for the large version. Go here to see the old version. The level 2 sentry can be found here, the level 3 sentry can be found here, the mini-combat sentry can be found here, and the dispenser can be found here.
Version 2 This is the second version of my level 1 sentry. This one has updated and nicer looking pictures, and the sentry's supports were slightly modified. Go here to see the old version.