editing a box

I imported a box that has a base, no top, 6 sides (2 sides, and a pointy top and pointy bottom) - think 7 segment display segment.

I made the sides about 1 cm taller, but for some reason the base also increased, just a bit, but it doesn't show the base dimension on the file.  I cannot ungroup because the feature is greyed out.  So the sides are 18mm on the outside but I can't get a dimension for the inside so I can determine the thickness of the bottom of the box.   How do I do this?   Also, there are two holes about 5 mm in diameter at each end, in the base, but I can't select those either to change their size, let alone even determine their size.


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