Perfect, that does the trick! So obviously I did not have issues with installing, rather a serious layer 8-problem... [:-"]

So this also quite remedies the inner-wall-length issue - it correctly shows the different lengths.

Thanks everyone!

<t>Tried to do that, put it on Win7x64 in "C:\Users\username\AppData\Roaming\eTeks\Sweet Home 3D\plugins" - that's where also AdvancedEditing.sh3p is which I installed as a test. Unfortunately, nothing seems to happen.<br/>
Where would I find a menu item or something if the plugin ran?<br/>
Anyone ...

I'll just jump onto this - I really looked around quite a bit, but could you point me in a direction how to install/use this plugin? I managed to install a SH3P-Plugin (Advanced Plan editing), but I just cannot figure out how to deal with the JAR-variant.
Thanks!