Ecotect Analysis using GH - adding surrounding buildings as shading factors - please help!

Hello

I am starting to use the GECO components to scale openings according to solar calculations.

I currently have a quick test model in an empty setting but would like to add other buildings as elements affecting shading, as obviously buildings do not sit in isolation.

Please could someone point me in the right direction so that I can test adding a few blocks in Rhino around my test project.

I have attached the Rhino file, GH definition and the weather file I am using.

Thanks in advance