Firehawk153,.......I fly out of a pasture also...With cows in it.. I spent a day leveling off a spot, with a wheelbarrow, a rake , a shovel, and a string trimmer. It turned out so nice the cows made it their favorite spot. Now it's trashed and I'm back to hand launching the smaller planes. If ya got animals in that pasture, watch out how much work ya put into it.
Been thinkin about that green outdoor carpet myself. Maybe mounting about a 100 ft of it on wheels so it would be more portable, I could just roll it up when I was done flyn'

Good Luck.....