Beginning Of The Skate Park

Today I started the skate park before I had to go to work.
I thought I'd struggle with making some of the objects but once I figured out how to create them it was smooth sailing.
So far today I've created a rail, I changed the dimensions of the box to give it a smooth curved edge. The other object is a spine ramp with a twist instead of a usual spine ramp where both sides of the ramp match up, I used three 1/4 pipes and joined them together with a rail. I'm having trouble trying to get some kind of backing on the 1/4 pipes though. Ive tried the Boolean tool but it doesn't work. I'll have to keep playing around with it.
Below are some images of the work so far.

Rail




Spine Ramp