Utah Windriders Association

I was at Pow Mow yesterday and saw that they have a whole bunch of straw bales leftover from their motocross event. They' planned on just busting them apart and scattering them. It looks like I can get them to drop them at the kiteski area and allow me to build a jump. Has anybody had any experience with this? How many bales high? How wide? How deep?
I was thinking just a
general pyramid shape. Maybe higher on one side is better?

I want to do this right and needed ideas.

Pyramid shape as high as you can get it!