Lots of photos and ideas, but honestly it's not rocket surgery. Get a cooler with a good, tight fitting lid. You can even do the dollar bill test in the store on the lid, but most coolers have a nice snug lid on them. Rinse it out with hot water when you get home, let it dry with the lid open for a day or two. That'll get rid of 99% of the plastic smell. No bleach, no chemicals....just very hot water and time. Beads, Bovida's, whatever.....put your desired humidification in there but don't forget a SensorPush or Govee to monitor the RH without opening the lid. I never lined or put shelves in mine as I always thought the wood took up room that I'd rather save for cigars. Lastly, bubble wrap will take up empty space and make humidification more consistent until the cooler fills up. Before my cabinet, I had 3 or 4 coolers running at the same time....and they worked perfectly. Can't recommend this enough.