In your SH3D you should have a piece of furniture called Box, select that and drag it in your project. Then you can change the size and height to fit your room.
In case the image broke: https://sta.sh/01138nje06xy
For baseboard, click on the wall you want to add a baseboard, then go to 'modify baseboard' then modify as you'd like.
In case the image broke: https://sta.sh/025aj598pp2k
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I'm more comfortable writing in English, but I can also write in French.
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(OvO) Hoot
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