Thanks for the comments.

Roy, as for B32, I couldn't see a place for it. It may go with B17 like you say, as part of the inner details. It has an odd shaped placement hole that didn't match up to anything else. It is very early to make predictions but mine would be that there will be an expanded "Premium edition" or Cyber-Hobby version of this kit, and that part will be used, along with the flotation equipment and indy tracks.

From looking at the interior photos posted in in the discussion on Missing-Lynx, it doesn't attach to the rudder control on the inside of the tank, B17. I wonder if it is the pulley attachment to the rudder on the pontoon? There's nothing else I can see that would use a pulley wheel as the kit now stands.

As a general note, I based my claim on the interior being white from the photos of the interior in that same discussion. This was the early variant. Later variants may have been painted the same color as the exterior. The entire gun would probably be in IJA Brown, or similar color. There's not a lot of info on the painting guide. The signal light on the box top appears to be, from top to bottom, blue, yellow and red.

I've been looking at online photos and although it is hard to see in most, it looks like the guns match the rest of the tank color wise. The box art shows a gray gun. I can't see an artist name for it though. Do you know who painted it? Also, which gray are you using? The two hobby stores still open carry Panzer gray, gull gray and a couple of other aircraft colors. I'll probably have to go online to get a color match.