Curves in plain edges I'm following a course in Blender. My assignment is to replicate a Bobcat S175:


I'm stuck at the part where I need to create the arms and back of the vehicle. This is how far I got:


For the arms I will need some sort of curves in the plains. I am wondering how to to this. To be more clear, I want to create these parts:



I hope someone has suggestions!



Edit: I tried making a mesh which looks like the back of the vehicle. I applied the sub surf modifier to this object and tried to play with the edge creases. However, I can't seem to get it better than this:
For those kind of shapes you can try using curves.
Start with a bézier curve, trace your object and make it a closed curve by selecting the first and last segments and pressing AltC



Make the curve a 2D curve and give it some extrusion.



Repeat that for the rest of the pieces.