We could give you some clues indeed, there are tons of related information already online. So let’s say we don’t know how Roombook works: how would you describe the workflow you need with existing Dynamo functions?
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Here are some of the related links that could help to get started on such a project:
This is for walls:
Lastly, you could need a couple of nodes such as Area, Sum and optionally Schedule.GetData from the BimorphNodes package.
If you already know how Dynamo works basically, the best would probably be to find a similar workflow to get started. If not, I would suggest to read the Primer first