Regarding the painting of the arati ceremony, yes do it as it is described in the song. The ceremony was held inside. No arati takes place in the open. Lord Caitanya was a householder at the time. Navadvipa lila means householder lila. The form exhibited was the Panca-tattva form, as it is described: dakhine nitaicand bame gadadhara. Not only are Brahma and Lord Siva but all demigods are offering. And, everyone has got sikhas.
Letter to Ameyatma dasa, 8 December, 1974