Introduction
Building a Multi touch screen needs preparation. Especially for a non technical person, which I am ;). I started my search a while ago by surfing the web and digging up all sorts of interesting information. A website that helped me a lot is: nuigroup
Nuigroup provides a place to share about natural interfaces, like multi touch screens.
People provide a lot of information about how to build your own MTS and which materials to use or not.