I have seen roof planes used as well for the plate stock, but IMO that is a tough approach. You also do not get the rafters cut to fit as your AC file shows.
Chief solids can provide the same thing as AC, but it is a tedious process. I do it because I would rather spend the time building the model correctly than trying to clean up the drawings later.
There are issues that arrise when using any of these methods for 2D display over the supporting walls.
I would not rule out using AC if i were you. Not because CA can't provide the end product, it just that the more complex the items are the more difficult it becomes due to Chiefs interface for working with solids.
I have a project coming up that will use serveral symbols created using solids in another application. Other applications often not only provide a more user friendly interface for working with solids, they also have features that CA does not currently provide, and probably will not for some time to come.
If you are interested, let me know and I will try to post a few pix for you.
Edit: Here is a jpg that shows the use of CA Solids in a project I did a while back. This is the first attachment I have tried in the new forum, so I hope this works.