Several observations, but please note I am not trying to be critical. I know you put a lot of time into this stand and I applaud your workmanship.
First, in my experience, that tarp is not going to last any time at all before it falls apart due to solar exposure. When this happens, you might want to consider a more permanent roof and siding solution.
Second, in Missouri you cannot hunt over scattered corn but you CAN hunt over growing corn or other crops or a mineral lick. Think food plot in your meadow.
Good luck in muzzleloading (now alternative methods) season.
What county is your land in?