Coud you tel me how to make the Floor of Perforated shape

[Hamish]

Here’s an old thread that got revived recently that could have something for you:

Floor By Nested Loops

Trying to create a series of floors from pairs of closed polycurves (an outer boundary and a hole) for a tower project that has an atrium - and every level is different. Is this seemingly basic operation not possible with dynamo? Tried DirectShape.ByGeometry, which seemed promising however then it doesn’t behave like a floor, so we can’t add slab edges or cut with a shaft for stairs, lifts and services. Any love of nested loops in floor sketches?