Lego!

[kresty]

After some double checking, my basic size for the Lego bottom seems about right.  I'm pretty sure that it is 69 studs across, so 552mm across inside the white skirt about 20mm above the cutout on the skirt.

The Lego Greeble Position WRT the Skirt on the Sentry Droid

So, the droid should be 552mm wide at the line above where I added the placement of the inner bricks.  Since we know the droid is ~25 5/8" wide at the bottom of the skirt, that seems about right - 4" wider at the bottom than my funny line.

The thumb in the below photo is about on the Lego level with the skirt edge.  (because of the perspective and flash that isn't obvious, the shadow is way higher than we can normally see - revealing the top of the last row of bricks, this is the only photo I have where we can see that far into it.).

We can see from there that there's a decent gap to the edge of the skirt - which fits with it needing space for 2 bricks above that level.  Of course the topmost brick may not be complete, they could have either not filled the mold completely, or filed off the corner - but the measurements fit.

Lego underneath Sentry Droid