Every one of the portals will have a themed front shell similar to this, including Starfall Racers, and including the park’s entry arch. The colors and markings may be slightly different, but these metallic arches will be installed in front of each portal, to give consistency across the park.
Given how wildly different each of the actual portal structures will be, having the front arch element remain somewhat consistent will help connect the portal-to-another-world motif across the park.