I have work troug/playing with Gimp 2, Inkscape, SketchUp, and Autodesk Fusion 360.
Below I documented some of the results of playing around using the Autodesk Fusion 360.
Autodesk Fusion Drawing
I already installed the Fusion while I was visiting Vestmannaeyar last summer.
Using the parameter setup in Fusion, I draw the frame of the telescope
I planned to use as an object for my final project.
You will found the associated Fusion f3d file at the bottom of this page.
The parameters names is not explained but You will found some of the parameter names on the sketches in the week 1 assignment.
As post sketching work, I have put my focus on the projected sketches,
and I learned how to create and export those sketches from Fusion.