This is the Star Wars: The Clone Wars Papercraft Model Kit
created by Rob Valois and released by Grosset & Dunlap (Penguin.com), it's an official licensed Star Wars merchandise.
It's a hardcover book that includes three papercraft models, each with varying degrees of assembly difficulty. The Clone Trooper Helmet model is Padawan (easy) level, then you've got an R2-D2 model having a Jedi Knight (medium) level, and finally the AT-TE Walker model is a Jedi Master (hard) level.
The book has a magnetic lock on the side, a common thing that you'll often see in kids books.
All the models are pre-cut and makes use of those tab inserts, no glue and cutting necessary.
I couldn't find any ruler around when I was taking pics so I put my DS beside it for comparing the thickness and size.
For $12 bucks with free shipping, it's not bad for papercraft collectors and a great deal for Star Wars fans. This btw, is a gift - I didn't open the pattern because I want to buy a second one first (I always buy two copies), one to make/destroy and the other goes to my archive. I'll post pics of the finished models later on.
Star Wars: The Clone Wars Papercraft Model Kit