Looks fun, what about a small block in the top corner for a gap up to the big block. Also, have one side of the sidehopping wall get higher in bike length steps and the other side like you have it now, makes a bit more out of the wall that way. I wouldn't line everything up so perpendicular, I would rotate a few set pieces 10-30* so that every gap has a range of sizes, possibly even tilt some of the top faces..
..and get some big concrete pipes in there