I've found an interesting blender script (crosssections) from Yorik:
http://yorik.uncreated.net/guestblog.php?tag=blender&com plete=3

I've adapted it to help me to search for thin walls:
1) Shows my item
2) now the script is called generating 5 cross sections parallel to XZ
3) I've moved the cross sections to allow better viewing

(not so bad. the original code seems to have troubles with intersections showing them as holes)

Woody64

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[Updated on: Sun, 14 August 2011 14:42 UTC]

And here's a pictur eof using the cross selection together with Blender Caliper for measurement.
Woody64

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[Updated on: Wed, 27 June 2012 18:47 UTC]

... some small enhancements to the user interface
- number of cuts selectable
- distance editable
- cut planes selectable
- filled cuts: but unfortunately that's experimental since
-- the blender/python fill does not cope correctly with that
=> if somebody has a code snippet to generate a list of linked vertices that may help
(since the problem arises when there are more then 1 closed loop of vertices in the cut, in that case the fill has to fill each loop of linked vertices in an extra step which may work)

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Solved a lot of issues (including my raw/k3d importer, which caused the previous problems)

You see one of my objects cut by 3 planes in each direction.

The YZ plane is shifted out of the resulting figure to take a deeper look on it.

On the bottom left you can see the new menu.

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[Updated on: Tue, 03 July 2012 22:12 UTC]