The area appears well-lit, although the fixtures do not appear in the photo. Perhaps some post lights behind the benches and get rid of the overhead carnival lights. Put a table top over the pit during the normal times, so the kids can kneel on the cushions all around and have a game board or activity/project area. When they get to be teenage, you can mount some screens in front of the area, so they can be hidden from your view, yet still at home, under your protection, and near the refrigerator.

Love the Tinman fabulous!!

Has anyone come across such a thing? I'm attempting to find a larger rectangular unit that can put out more BTUs than a single propane tank can handle.

I’m think you’ll may be stuck starting. Have you been working to any plans or inspiration pictures? If not you need to head to Pintrest and save some. You need to know what you’re trying to achieve. What shape are you trying to accomplish? Will all the seating be stone? What will be the base? Is the little fire holder shown the final one you wish to use? How many would you like to seat? Etc.