Hi @Jasperbru,
It’s impossible to tell if what you’re trying to achieve is doable in Dynamo, unless you share some sample files and a detailed description of your end result. Have you tried solving the problem yourself? A good first step would be to collect all the foundation instances that need to be dimensioned. There’s literally hundreds of examples on how to do that throughout the forum.
Also, be sure to check out this topic for some tips on how to better formulate your question next time.