for being a cad tool Fusion lacks some very important drafting tools such
as drawing a line perpendicular away or to a circle/curve
or construct a line perdendicular between two curves
Rhino has these features since years.

Via tangent constraint I can make one line tangent to a circle or two and thats it in Fusion.
But it seems impossible to make a line perpendicular to a curve
https://drive.google.com/file/d/0Byzv_NlyKp_2RENYT1VQRU9YZ28/view?usp=sharing