Who told that Lego are only vehicles and buildings? No, with Lego you can create everything.
And I decided to make a chainsaw. I wanted to make it as functional as possible and also durable that children can play with it. So I chosen Lego Technic and here you can see my product - chainsaw with working chain connected with Lego Technic engine. Model is very durable and children like playing with it.
Thanks for support and comments.