Oh dang, I've just been on the previous page editing my post; spelled something wrong and also sounded like I was saying 'stuff your build, I only care about...' which wasn't what I meant to convey, sorry. I do get the notional construction but thanks for the response.
But! Are the stars MEANT to be solid all the way through? The H channel does wrap around the Koolshade but that stuff isn't one big sheet, it's twelve little triangles. We know that they run pretty close to the centreline of each arm from Gene's pic of the broken one, but do they go the whole way there? If so that's gotta be a hellishly flimsy construction.
Rather than making completely thin, flat stars which lie on top of the Koolshade, could one not cut a picture-frame-like rebate into the inner sides of the arms, but leave a mating surface down the centreline of opposing arms?
I'm just looking for any advantages or explanations for the thick star arms...