

All this talk of what the Ghidorah design's going to look like, and yet, am I the only one thinking of what Rodan's and Mothra's designs might look like?

I think the reason their is so much discussion is because Ghidorah stands the largest chance of being messed up. Mothra is a giant moth and Rodan is a giant pteranodon roughly speaking. There's a lot of room to work with.

For Rodan, yes. Just find a picture of a real Pteranodon, increase its size, add the parts that distinguish Rodan, and there you go. Lol.
For Mothra, though, I feel like she might get her wings changed a bit, like she did between the Showa and Heisei eras, and from her look in GMK to her look in the Kiryu saga and then back to her pre-Kiryu look in Final Wars. Plus her color pattern changes too, so one wrong color error, and it might get disgraced.
Do you see what I mean for both of them?

I do, but I think as long as they don't chose ugly/mismatching colors, it won't be so much of a problem. I do think that mural that was released last comic con is pretty indicative of what Mothra will look like, so as long as it looks like that, I think it'll all work.