VKB-SIM

So I just picked up a Gladiator Pro pre-order. I'm super excited for that but I had some questions. Obviously the Gladiator Pro stick is modeled on the KG12, but there seem to be some differences between what comes with the Gladiator Pro and the KG12 grip itself. So, my questions are:

I've read the KG12 grip will be aluminum. Is that true? Does that mean the Gladiator Pro stick is plastic?

Are there button differences between the stock Gladiator Pro stick and the KG12? I have noticed the pinky lever from the images of the KG12 that doesn't seem to be on the Gladiator Pro, but that is the only difference I can see from imagery.

Can the Gladiator Pro base work with a KG12 grip when it comes out?

Thanks for the info. Super excited for these products!