The Grady Thrasher Twin Aircoupe was deconverted back to 2x ordinary Ercoupes and sold after 1950.
One little technical detail on the twin was that the outbd rudders only moved 'outwards' whereas the centre rudder could move L and R.
He had fitted rudder pedals to the a/c to facilitate aerobatics -some ercoupes did have conventional controls but the Grady a/c originally just had the control wheel/yoke configuration - crazy idea LOL I once had a flight in a friends aircoupe and found the lack of rudder pedals very odd
