Thank you for your response. On the first question, if you notice behind the corbel, the stone does not go all the way. There is a little corner showing the stud or interior wall material I suppose.
Maybe I drew it wrong from the start.
I started with all my exterior walls and the roof was all built at the same level. Then for the bump outs, I added some interior walls to create a small section so that I could change the ceiling ht. for that section. I made those walls invisible because this is the garage we are looking at and I didn't want a small room within the garage.
For the second question, I suppose I can use some square column from the library and change the material to stone, but what about the top section? I would like the columns and arch to be the same stone material. I've added a Stone Porch pic I found on the internet to show what I am talking about.
Perspective View 3.pdf