The easiest would be to go online and take a look at photos of jumper courses. Go out at Spruce Meadows and take a look at whats out there but I think it would be nice and easy to just look up photos online.
Where are you planning to use and put those jumps??
Wait until you find a barn you like before you make plans to build. The place you might just end up boarding at will have more than you can imagine
Hehe yeah, it's not in my immediate future to build these, but I think it would be a great project! I've designed a few while at work (bored out of my skull and not allowed on the 'net) and I'm very excited about some.
The lovely images above provided by CVLC Photography cvlphotography.com