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this is good to refer to.
Step 1: The foundation
for on the grass select a somewhat level aria of ground.
plot out a rectangle that is 8 ft wide 20 ft long.
level it all out make some footers out of bricks the bricks should in the ground so the half pipe will also rest on the ground but the bricks help it a ton.
It's very important that it will be level when it's done. and stay level for a long time.
Step 3: Finish the transitions.
for an eight foot half pipe you need to cut every board 3 ft 11 inches!!
pic 1 in all you need to make 4 of these!
pic 2 do this to each frame
3 you'll end up with 2 of thees.
Step 4: Flooring
you can build this part as long as you want but it sa to be 8 ft from side to side.
mine is 4 ft.long ,yours can be 6 or so but I wouldn't go over that.
the cross beams have to be 7ft 9in.
Step 5: Construct
they might be hard to get in you might want to take off the closest beam to get your drill in there.
Step 6: Surfacing
you will need 6 sheets of 1/4 inch ply wood.
and 1 sheet of 1/2 inch ply wood if you are using the 4 ft. flooring witch I think you people with small pocket books should use.
Step 7: Copeing
Some people use big bolts that will go all the way through the wood and then use nuts and washers to hold them in place. ***recommended***
big wood screws would also work. *Works*