IMO it would be really handy to have more elaborate snapping and aligning tools like Adobe Illustator's smart guides.

Being able to intersect and subtract objects would be nice as well.

Ok, i think this is working:

Wall.
Place invisible box inside wall, this creates a hole.
Place glass box / pane inside hole.

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The pane doesn't need to be as thick in order to create a hole in the wall. So I guess all I need is a good glass pane that doesn't act up after rendering.

Sorry for all the questions lol.

The glass box will only create a hole in the wall if it's at least as deep as the wall? Leaves me with glass as thick as 30 cm.

Fatal rendering error?

Aaargh!
The panel loses its transparency after rendering. Or it acts real weird, half transparent or something.

There was a 'glass box' model I had before but can't find it.
Any other glass objects I could use?

Thanks.

Yes .KMZ import works.

Thanks a lot!!!

Ok, importing .KMZ files works!

Is there a way to disproportionately scale a window or frame without it looking all streeeeetched?