I love garden benches made from beds. They have so much more character. Give it a good coat of primer, caulk the top seams where rain might get in between the wood pieces, then paint it your favorite color & seal it. As you can see in my bed bench post, I didn't prime first & our Texas heat has peeled the paint. Of course, my bence isn't for sitting on. It's just for junk. Vickie

Much depends on the type of wood and construction of the set? If solid wood verses veneers. Also you would have to paint (exterior paint of course) every bit of the table and chair. Leaving no surface hidden or unpainted. Then you might have a set that would last a couple of years. But why chance a good indoor dining set??

As wayne points out what you propose is far from correct for a number of reasons and in fact is QUITE dangerous. I would recommend you have an electrician install the subpanel at LEAST. First, NM is not allowed to be used in this situation. It's not rated for wet locations, use outside the house/building, not permitted for messenger supported use, and most likely not rated for sunlight exposure. As Wayne points out you must use either a cable that's allowed for aerial use or really consider running either rated cable or conductors in conduit underground. The messenger, if used also has to be appropriately supported and grounded. You have to use an approved lashing or messenger ring system to attach the cable, you can't just wire tie or tape the cable to the messenger. FYou also probably want to run 240V to your subpanel. That's going to take four conductors (two hots, the neutral, and the ground). If you install a subpanel in the outbuilding (i.e., there is more than one circuit there), you'll need a grounding system (rods) there. You don't technically need a main breaker out at the subpanel if you can kill all the power in less than six handle throws, but I'd recommend it. You might consider having an electrician put the feeder and subpanel in. It's a lot easier to install your own branch circuits in the subpanel than running the feeder.

Whatever pretty stone you put out there will quickly get covered in dust, dirt, pollen, bird poop, rodent poop, grease, etc. I have an outdoor granite counter that is not under roof and faces directly west in So CA, so it gets baked by the sun daily (except for the last few months that have been unusually rainy, overcast and cool). No issues with my granite counter, other than it is one more outdoor chore to keep it clean. Are the guys that are making comments fabricators?