For the purposes of a crowdfunding demo I've mocked up the U15s from floral foam containers of the same size, and fashioned facsimiles of the 40" propellers from fascia board made of expanded PVC foam. Every car you've ever driven, whether or not you were aware, will have been rendered as a full-sized realisation prior to production... which makes you wonder however they decided to go ahead with the Renault Megane.
