For reference: here are the measurements on my Chimera. While it is converted for the "mid turret" variant, one gets the picture regarding the widths
Now @ Bilge Rat: looking at the second pic from my first post, those side parts that are not part of the "Command module" look a bit broader than 2.5mm. But unfortunatly it is really hard to see. I guess I will take a shot and order that part, maybe I find a way to put it on the Chimera.
Edit: found another pic where you can see the piece better:
So it seems much narrower than the whole Rhino. But on a second look I have doubts again if this will be the road for my command Chimera. Nonetheless posting here for others considering the conversion