@CaptainCook
1. I am a silent admirer of your projects.
2. The correct approach to your question is like in real life.
Make the roof as it should be(outside the walls) and cover the gap under the roof with another piece of furniture (box).
Preferably on the same level with the roof.
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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
