You may have noticed my other thread that I just started. I'm looking to get into DJ and I'd like to build something in my yard to get things started. I don't have a ton of room so I'm thinking I can build 1 small gapper to help me get speed for a larger main jump. I want something that would give me enough air time so that I can start tweaking things out and learn some tricks. I do have experience hitting jumps on my freeride bike but I'm definitely not super-confident in the air. So I would want to to hit it with my 7x7 freeride bike as well. How tall should I go? Is there a rule of thumb with length vs. height? I was thinking a wooden launch with a dirt landing, any problems with that? What's best for learning standard gap, step-up, step-down?