Good idea if you have rock solid ground that is hard to dig up. If you don't cover the holes you can use them for herbs & annuals. also lined with weed barrier cloth & used rebar in several places for stability. It makes maintenence super easy.
om sunlight and darkness of night can also be endowed under it. The place can then be used as a study room or even a dining room. The usage of pallets makes the place antique and attracts the visitors.