anything other than snow is going to ruin your bases. base materials weren't designed for such unlubricated, abrasive materials. your best bet would be to get an old pair of skis which you designate as your urban/ backyard set up skis or you will regret ruining your nice park skis.
as for how to go about choice of materials and buildign your set up the Build-A-Jib 101 Cult will be your best source of information
https://www.newschoolers.com/culthome/453/Build-A-Jib-101