Those designs are great for what they are, but that's a new movie based on an old thing. It's a new spin so you can change things like that. But if you're bringing back the actual original characters from the TV shows, I'd want them back the way I remember (and like) them. You can tighten up the construction, but don't change the look because it's fine as it is. I mean whenever they do bother to have the old guys back in everything but TV (stage shows, games, books, toys, etc.) they keep them pretty much the same because that's what people like and remember. They're easily recognizable.
The old stuff works fine as it is in the modern age. Just make it out of more contemporary materials, that's all you really need to do. I'd rather they devote more attention on designing good-looking new characters.