What Am I? The Switcheroo

Last week’s What Am I? was the bottom of a ‘59 Autobianchi Bianchina Trasformabile Convertible (based on the Fiat 500) that was solved by Dr D who dedicated his internet stardom to FTB who solved the previous week’s WAI puzzle.  Time to figure this next one out — What Am I?

Solve the riddle.  Be a star.  What is this thing?  Comments below.