Okay.
I have finnished my guardrail profile.
My approach have been this:
Opening the profile image in UV/Image Editor.
Object mode
Create a plane with the outside dimensions of the object and set y location to 0.
Created 3 planes with one side corrosponding with, one of the measurements from the image and alligned these with location y 0. Plus 2 more alligned visually.
Created a circle with 9mm radious and decided that 14 vertices would work for me.
Dublicated this multiple times with Shift D and moved each to its possition. I did not create an extra this time, but I would do that next time, as it will come in handy later.
Shift to Edit mode Chosing edges
Using shift and/or crtl to select the unwanted edges and deleted them from all of the circles.
Shift to Object mode
Chosed what was left of one of the circles.
Shift to Edit mode Chosing vertices
Chosed a vertice and hit Alt E, to extrude it close to, the next circle or the edge.
Shift to Object mode
Selected pieces to join with Shift leftclick, then Crtl J to join.
Shift to Edit mode Chosing vertices
Selected vertices with Shift leftclick, then Alt M to join.
Continued until the profile was complete.
Zoomed in to a certain level, moved along the profile, aligning the nessesary vertices with the appropiate plane edges.
Used the extra circle to align the curve vertices, then deleting it.
Shift to Object mode
Used Object/Transform/Origin to Geometry to Center the Anchor/Pivot point.
Deleted the guideplanes.
Shifted X Y Z Locations to 0.
Used Shift D to duplicate and M, to move the copy to another layer.
Saved the file with a new name.
This is where I am now.
Well not entirely.
Today I have detail photographed a Guardrail of the same type.
With and without a ruler, so I can get the joints correctly. It will also be the basis, for my first attempt, to create a texture.
The ball is rolling again.
Happy tracking.