The Scuderi design is essentially an external combustion engine. While it sounds attractive in principle, in practice it is not all that great. The problem with designs like this is that they tend to have very high heat transfer and pumping losses, due to the fact that it has to transfer the high pressure working fluid from one cylinder to another. Unfortunately this cannot be done without loss of pressure (blowdown), which also means loss of available work that can be extracted from the working fluid. Also, passing a hot gas through a cool metal duct at high velocities, makes for very high rates of heat transfer. And heat loss is bad for efficiency.
The Scuderi concept is nothing new. It's long been known that the best and most efficient way to extract work from a high temperature, high pressure combustion process is to perform the intake, compression, combustion and expansion functions all within the same tightly sealed, minimum surface area volume (ie. an open-chamber, recip piston engine). The most efficient and cost effective engines are still the big, slow turning, 2-stroke CI engines used on large ships:http://people.bath.ac.uk/ccsshb/12cyl/