organcandle, there might be some other interesting info posted on the Wake County Register of Deeds site that you might be interested in for Thornburg Ridge. Here's how to search:
Go to the Wake County Register of Deeds website search page:
Books! Online Records Search
Then do two searches - first one, type in "Thornburg Ridge" in the Grantor field. A bunch of documents will pop up - best to click on the .pdf file red logo next to each. Then, go back and search "Thornburg Ridge" in the Grantee field.
There are plats of the subdivision recorded, which show if there are any easements recorded for a particular lot, and any future easements (for future roads, etc.) That along with the Covenants is typically what I find most useful from the Register of Deeds website.