Replying to Summer setup for a beginner?

I just started skiing park this year, and my progression has been somewhat slow. i am learning a lot in the air, but when it comes to rails and boxes i just cant seem to get my balance right. i guess most of the time i can grip a box consistantly, but when it comes to blindside and spins on and off i am not even close. my question is would it be a good idea to build a rail box thing for the summer to try and learn some basics?