There's nothing inherently difficult in the design and manufacture of turbines with todays CNC machinery. It's got fewer parts than a piston. Therefore, it is possible to design a turbine that would cost less than any piston engine. All it takes is one visionary and it could be reality tomorrow. Don't expect it from the old guard, tho - they're to comfy with their overpriced military contracts to do an about face. It will have to be an outsider.
If this is the company, I don't know.