Grasshopper File for Laser Cutting

Im trying to make a lasercutting file from boxes of buildings but I’m kinda stuck with sorting out to pick the correct faces and to lay them flat on the ground. Got any hints for how to work that out? (51.6 KB)

Thanks in advance!

If you are using OpenNest, the purple group is all you need. Otherwise, the rest of the code does a “simple” linear layout of the faces. (54.0 KB)

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Thank you for the quick reply and helping me out Joseph - much appreciated!