450EX references the overall length of 45.0 feet and the design's experimental nature (EX). The design brings the auto and yacht market together, showing the potential for future partnerships between the two. Monro avoided using any literal car features, which can often look forced, and instead brought in elements to an existing hull and adding recognizable Rolls-Royce brand details. The tender's interior features four executive seats that immediately bring a luxury auto to mind, each featuring the Royce logo, as well as two pilot seats. There's also a bathroom and a bow entrance.