Replying to How to build a good jump on to the rail

So my summer setup was originally made for the winter so it goes onto the ground with no wood under me, just carpet and dirt and right now, I am using a crappy plastic skateboard ramp covered in turf that was $5 at a garage sale and it moves around a lot, is too skinny and needs to be wider. I want to just build one out of wood so it wont move...help. I also didn't know if the lip should be curved or if the jump needed to go up flat at an angle. Please help and pictures would be appreciated. Thanks!