New since last week: (04/13/2020)
-upper rafter support
-lower rafter backing board
-upper rafters 
-eaves support
-upper rafter backing board
Next up are the hold down beams, ridge beams, stub posts, and hidden roof struts and purlins.
New since last class: (04/15/2020)
Added a fully procedural system to make the hold down beams. Took a bit longer than expected, but hey, it's fully procedural (and a mess of nested for-each loops). Next up is figuring out the curvature of the roof and using that to determine the height of the ridge beams.