Series array with different types of geometry per addition

Hello everyone,

Currently  I am making a scrip where I want to achieve different heights "per floor" I have a created 3 different types of geometry that has the same perimeter but differs in height. I wanted to ask You if there is a way to use an image sampler with a greyscale image (where black would be type 1, grey type 2 and white type 3) or just by writing down which type to use on which "floor" in series by adding the right component?

This is a diagram showing what I want to achieve:

I managed to make the geometry to stack upon one another without overlapping, but all copies in Z axis are the same height of one type.

Any ideas on how to achieve this?

I'm adding the script in the attachment.

Any suggestions are more than welcome,

Thank You