Michael, thanks a lot for working on the much needed hidden line removal.

I attached a nice pdf about the two lineweight illustration principle from
http://purdy.gatech.edu/wp-content/uploads/2012/07/2_line_wt.pdf

I don't know if you can control line caps on export but this is also covered.

It doesn't hurt if the hidden lines also get exported as long as they can be easily turned on and off like on a seperate layer for example.