Unfortunately the SH3D don't handle yet the hols in surfaces.
You must use some aids(tricks). Example:
In 3D is not visible and in 2D You can delete the wall(s) after the rooms are created.
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A computer program does what you tell it to do, not what you want it to do. Murphy's Law
When all else fails, read the instructions. Murphy's Law
If you don't like "AS IS", DIY. Dorin's law
