Use poligon tool [P] for make all the car. Just make the details and all will be ok )) This is very hard for me and for you.
1.Go to the destkopmachine.com
2.Download some car picture.
3.Enter this picture in Algodoo
4.Take Poligon tool
5.Draw with holding Shift key (it makes straight lines)
I did it in last month. It's ok, this is just one of ways but most populary method is a poligon tool. You can see my first scenes, all my first scenes i made with cut tool.
Oh, it's just 3 pixels on my monitor.
When i started scene i waited for something like big box with text like "ITS JOKE LOL" but it didn't Then i turned on windows magnifier, And i saw the little moving 3 pixels )))) I pressed arrows and it worked ) You're genius X-ray )