Replying to Thickness Of Outdoor Carpet-summer set up

alright so since ive been hurt all year and since my parents dont want me to get hurt again an they think i will die i am not allowed to go to hood this year which pisses me off so i have decided to make the sickest set up in my yard. i am getting a tramp and i have room for about 12 rails or boxes and i built a jump which is big enough for 3s but l just make it a barrel jump. anyways i just want some ideas of what to make, i am limited to boxes and pvc rails no welded stuff. my main question is how thick my outdoor carpet needs to be.