I have an Agfa Super Silette I was going to do a black paint project with, but it hasn't materialized for any of a number of reasons.
The match between your plates and coverings is very nice, and will look just fine when complete. Going through my archive, I found a photo of a Leica M with orange coverings, and it was alright, but one done completely in Pepto Bismol pink was what I considered stepping over the line. Any other shade than that is okay by me.
With a bare brass IIc I would make sure to get a coat of clear on it as soon as possible.
PF