Theodore,
I would work on the systems but I have a few other features that I feel that I should implement on the OpenStudio component first:
https://github.com/mostaphaRoudsari/Honeybee/issues/359
Also, because it seems that support for radiant systems is really important for making my comfort components take off, I might try to implement some radiant stuff before turning attention to the ASHRAE systems, which are all air-based.
In other words, if you could take on these missing ASHRAE systems, it would be a HUGE help.
-Chris