How to Build the Lego Technic Chainsaw (with Power Functions Motor)

Building guide for my own Lego Technic creation.
Like usual I wanted to make model as compact as possible, with more functions. And here you can watch me new product: Lego Technic chainsaw with one motor and working chain brake.
For completion you will need three Power Functions parts: Lego Power Functions switch (8869), Lego Power Functions L-motor (88003-1) and Lego Technic Power Functions Battery Box (8881). Chain brake is connected with the Battery-box, so if you touch this brake Battery-box is turned off. L-motor is strong enough to rotate the chain and compact enough to fit into the frame too. Switch is banded with rubber-band and thanks to it returns.