Not to bring you down or anything but idk what your building that just for(tricks or just to jump), but me and my friends spent a **** load of time to build a jump just like that. We used it for a while, everyone bottemed out even with a landing ramp, we found out that it had too much of an incline. It was more of a kicker then like a jump on a track. We ended up just destroying it after someone got injured and made it less of an incline and made it more like a launcher and we loved it much more, and we didnt need a landing ramp. Save your self some time and an injure and dont make a kicker.
But if your trying to make a kicker then its comeing along great. Its a tun of work to keep them nice. hahaha have fun, dont get hurt.