wsm wind shield

Hi folks, I wanted a windshield for my WSM 18 to get better fuel efficiency and constant pit temp. I don't want a permanent stone or wood "furniture" style, so I came up with this portable windshield idea. It can be just one 4x8 ft 3/4 in thick plywood, but I did it with 1/4 in thick to save...

Am tired of Ohio cold temps, wind and rain driving down my WSM 22 temps. Have messed around with homemade windscreens, frankly I'm too lazy to build a real-deal hinged plywood + bells and whistles setup that I would have to store. To make this problem go away am about to drop $130 on a BBQ Guru...