Triangle Tessellation, Random Fill

Hey everyone, I’m new to gh and have been struggling to try and Frankenstein other tutorials to achieve my desired results.

Ideally, I am looking to try to replicate the canopy pattern in the Westfield shopping center, in London. The closest I have gotten is a decent sweep in a unique frame, where I struggle the most is the ability to randomly select a series of the given triangles and provide an in-set fill. Currently I have a set organic plane planned to fill between masses, so ideally I would like to be able to begin by setting one surface. Lunchbox, weaverbird, and pufferfish are all on the table any help/tips/ or more would be greatly appreciated.

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