The members of a rock band known as the Sirens have always wanted to be transformed into... REAL sirens. (No not the firetruck kind, the mythology kind!)
What they're doing here, you typically can't have done in a regular Monster Shop because they don't usually have the space for it, i.e. the ceiling height, or a door big enough for you to get out through. So they had to pay big bucks to have a company rig this massive setup on the beach. And there were the permits, the consent forms for merging four separate people, the Disney license fee, etc... that's the kind of thing that usually only a very rich person, or a successful band, can achieve.
Anyway, the results are great! They give concerts for passing cruise ships now.
Drawn for resistanceking01.