Rainbow Drive-In’s expansion at its longtime Kapahulu location near Waikiki that will include several other Hawaii favorites such as KC Drive Inn, Poke Stop, Hoku BBQ Chicken and Hawaii Nostalgia Studio, as well as Rainbow’s, will officially open for business on Thursday, the owner told PBN. PBN first reported about the new venture, which will be called "Hawaii’s Favorite Kitchens" and will feature foods from the five companies as well as retail component with nostalgic gear from Hawaii Nostalgia…