This is dynamic, you can set the two major dimensions of the profile and the thickness of the stock through the Component Options Box. And you can't accidently scale them in your model - after all, this is supposed to be a representation of metal angle stock you can buy!
I've hidden many faces and edges to make this look like a single piece in your model. If you want to see the detail, turning ON Hidden Geometry will show a bit - the lower level components used to make this. To see absolutely eveything, you'll have to edit the sub components, select All, then unhide!
I should mention that the treatment of the edges - the roundover, and the cove where the faces meet, are features of one particular manufacturer of hot rolled steel. However, as long as you don't need the roundover squared (for easy "snap to" in Sketchup), you should be of use to you while modeling.
I hope y'all find this useful.