Do I need a projector and interactive whiteboard in my teaching room to teach SNAB?

No, but if you have a projector and screen sometimes, that can be very useful.

An ordinary screen enables you (or a student) to show the introductions and go over some interactive tutorials. An interactive whiteboard just makes this easier. You can write over the top of the animations, click to the next screen without bending down to the keyboard, and so on.