If I may make a suggestion though. Put some bracing between the upside down "V's" maybe a foot below. Then run a 2x4 the 8 feet on top of that screwed down.
This will keep it from collapsing downward and falling like a domino. I hope I explained it ok....
Have fun with it !!!
haha! that's what happened the first time we made this. It ended up falling like a domino when I failed on it, only got about 3 runs out of it. we put braces under it this time and it seems to be holding up! Thanks for the advice though!