Restrict furniture usage to specific race?

[Sandwich247]

I'm trying to make a mod that is more or less a peeler machine for skeletons, but it gives you AI Cores instead of skins. I've made a basic version, but I can put humans in it too. I need to find a way to make it so that either I can't put non-skeletons in it, or it won't do anything if a non-skeleton is placed inside.

Is this possible?