Grid shell roof structure - how can I make the joints?

Hello everyone!

I created a roof structure and now I am a bit unsure how to do the bolts and the elements in between the beams. At the moment it looks like this:

I took Center Pompidou Metz as a reference, and I am pretty much trying to replicate the same structural system.
work-shop-001-041

image

Also, I was wondering if there are other ways I can make the funnels on the sides? At the moment they aren’t very accurate either.

gridshell structure forum 19.04.2021.3dm (558.9 KB)
gridshell structure forum 19.04.2021.gh (18.0 KB)

I would very much appreciate if anyone has any suggestions on how I can solve any of these.
Thank you!