The stairs are for evacuation and as a “feature” play area. Therefore they should have a diameter of at least ten feet. The balustrade should be transparent and extend to the roof for play (climbing net) and safety reasons. The handrail should be either separate from the balustrade, or perhaps a narrow stretch of the play net that would be used less as a toe hold for climbing.
A possible sk8 feature is a pneumatic run, enabling sk8 ers to fly on a cushion of compressed air for part of their run.