Scale a room

Geometry
1

Hey,

I need your help: I need lines in front of every wall in a room with a distance of 70 mm
Is there a node to get lines parallel to RoomBoundaries by a distance into the Room or as an alternative getting PerimeterCurves of a Surface into it?

Thanks and best regards,
Thomas

2

image
image952×503 42.6 KB

Something along the lines of this?

3

Thank you, Robert!
the node PolyCurve.ByJoinedCurves was missing,
now it is working