How to build this?

[Jaco van der Molen]

Hi all,

As you might know (or not) but I was a contestant for LEGOMASTERS Netherlands/Belgium 2020

A cameraman from LEGOMASTERS Netherlands/Belgium asked our group if we could build a classic camera rig / boom.
This one:
https://www.flickr.com/photos/brian_will...237539889/

I understand most of the model and with a few tweaks here and there made a digital version and instructions for him.
For what I can tell some parts are not LEGO or custom or cut.

The one thing I do not get is how the camera rolls are build and attached to the camera. Anyone any thoughts?
I asked the author but no response so far.

Also, the clips that hold the rail are not LEGO too, are they? If so, what part is that clip?

Thanks!