I had two local wood-working companies come to bid on our fireplace; I heard back from one of them. The bid came in at more than $1,600 with a five-week lead time; we're going to pass on it.
We're also now talking about plan B, which might include a nice tile around the mouth of the fireplace and another round of bidding for a wood frame to that tile.
We always love hearing suggestions from the internet, though...consider this your palate:
A Tiny House Community Going Up in Colorado
6 hours ago