Replying to Some things you can help me with.

K so im thinking of makin a summer jib. I want:

1. to know wether astro turf or outside carpet is better speed/control wise. what do you ask the person when you buy outdoor carpeting? it sounds vague
2. my area I would build it in is very flat, so how tall would my drop in need to be? what is a link to drop in build instructions.
3. a link to some box making guide. i want the box to have 5 or 6 pvcs next to eachother and about 15 ft long, maybe 1 or 2 ft high.

how much, using a questimate, would all this cost?