Forget the retractable hardtop.     Mazda should make a hardtop version and a convertible version.    Put a sunroof option in the hardtop and that will satisfy 75% of the market for the retractable hardtop.     It would be lighter, stiffer, simpler, less expensive, and with a hatch - more spacious (luggage and headroom) than a retractable hardtop.    Make some competition for the BRZ's and FR-S's.       i.e.:    Go after two completely different segments vs one segment with a small target for the addition of undecideds (who can't make up their minds between a convertible or a hardtop).