And even easier way to accomplish #2:

Nice ans imple Chipp.

thank you.

A little variation! (maybe less complex - Solid at the end are not separated here) ;)
As you see with the vertical lines Inset is moved on the left from its dimensions so draw your Arc Circle in consequence! ;)
http://moiscript.weebly.com/uploads/3/9/3/8/3938813/variation.3dm

Thanks for sharing Frenchy!