I like the idea, but the execution could use a little work. The shot seemed very wide for the amount of action that was actually occurring - my eyes originally began following your progress on the jump, but quickly shifted to just watching the clouds in the background. I would maybe move the camera to a tighter shot, closer to the rail to put a heavier focus on you shoveling/building. Also, be careful about the angle of the sun and where you are putting your camera - the tripod shadow was distracting and fairly obvious and could have been avoided easily.
Also, as a slight aside, you don't need to limit yourself to one angle within a timelapse. A way to make your timelapse more dynamic and engaging, especially when involving the building or setup of something, is to change the angles somewhat frequently. You will end up with a handful of mini-timelapses, but when put together in sequence, they can build a much stronger story.
