I use paint.net on a daily basis to create sketches for structural engineers.
Here is my library, hope you find this useful. I will likely add more shapes to this in the future as I need them. The detail level is just for sketching so there is only one profile per section type. Should be good enough.
If you have any requests please post here and I will do my best to update the library.
See Changelog for downloads.
No New symbols added this revision. Just some changes to the symbols to get them working correct with the default fill tools.
CSA CAD TOOLS R2.zip
Uneven Leg Angle
Equal Leg Angle
North Arrow Simple
North Arrow Fancy
Flag (Field / Shop)
CSA CAD TOOLS.zip