I was just looking at your planning bio and wanted to share this with you. I saw your inspiration to do a semi-circle for your ceremony. It is definitely do-able indoors with the right type of space.
Have you seen any of the pictures from The NotWedding Atlanta this year? The "ceremony" and "reception" were both held in the same room, but I'm sure you'll get my point..
Clicky:
The NotWeddingThis photo