Sentry Droid is 25 5/8" wide47 viewsThe measurement from the outer edges of the base is 25 5/8" wide (might be a hair larger, but that's probably within 1/8")
New H-015 Omniwheel mount0 views
Exploded view - Laras new H015 Omniwheel mount.2 viewsEach side has a 10x26x8 bearing, some spacers. Square shaft in the middle. Coupler in the motor fitting side. Have to attach motor to housing first or it'll be a pain to attach the screws.
Shawn's 3D Model of H015 Sentry Droid69 viewsThis is a fairly accurate 3D model of the outer shell of the sentry droid. It is provided in several formats.
Additionally, there's a "flat" PDF (& cdr) of the panels which can be printed at 100%. Note, however, that the panels are the front faces and don't account for the depth of whatever material you might cut, so you'll either need to cut them a hair smaller, or sand/fill, etc. if you try to use those to build a model.
The "skirt" fits over the Lego greeblies in this version.
H-015 Sentry Droid on Star Destroyer around Jakku28 viewsSentry Droid in Hanger Bay as Finn & Poe escape
From http://starwarsscreencaps.com/star-wars-episode-vii-force-awakens-2015/13/
H-015 Sentry Droid on Star Destroyer around Jakku26 viewsH015 Sentry Droids in Hanger as Poe and Finn arrive after raid on Jakku
From http://starwarsscreencaps.com/star-wars-episode-vii-force-awakens-2015/6/
H-015 Sentry Droid on Star Destroyer around Jakku20 viewsH015 Sentry Droids in Hanger as Poe and Finn arrive after raid on Jakku
From http://starwarsscreencaps.com/star-wars-episode-vii-force-awakens-2015/6/
H-015 Sentry Droid on Starkiller Base22 viewsSentry Droid in hall as Rey escapes
From http://starwarsscreencaps.com/star-wars-episode-vii-force-awakens-2015/63/