Ranom Tessellation and Weaver Bird

So I have this definition that has a series of lines conected to another series or rancom points, well "random" cause the items have values that have to be manually added though they were added in no particular order to sort of make a nice shape.

So i was wondering if anyone knows how to make it truly random, to force grasshopper to choose the points, and for it to be automatic because the definition also makes the tessellations change depending on their height, you{ll notice that when you run the definition, the polyhedrons are bigger at the bottom.

Weaver Bird: And also a small doubt, been looking into weaver bird and so far I have managed to put a skin on top of every single volume... however i'm wondering if i can tell weaver bird to add a skin... on lets say 3 figures at one, so that instead of the 3 figures having 3 separate facades they end up joining with each other... sort of like in the drawing i´m adding.

So thats all .. thanks and have a nice weekend everyone.