Replying to A few quick questions

I started skiing park this year and i have decided to build a little pvc box just to get more comfortable with the action of gripping a rail/box. I have some questions (haha, i know the answers to most of them but i need some backup), mainly for my parents just so they can feel a little more comfortable with this summer jib idea, and as always, +k for good responses.

Will i be able to make something portable/able to be stashed away?

Will it mess up my skis/other equipment?

Will it cost more than 20 bucks?

Will i hurt myself?

Will it help me with my skiing?

Thanks guys