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@gbj_tester
Is that a Shimano CN-NX01 chain? Why don't Shimano make an actual track chain?
Chainring is an "interesting" choice too, Cycling Weakly says composite, @MagnusBackstedt says PEEK. Raw PEEK doesn't seem like it could be stiff enough for a chainring without being either about an inch thick or reinforced with some stiff fibres, so it could be both. My thinking on reducing drivetrain losses tends towards more stiffness and hardness than the standard aluminium, i.e. steel teeth, maybe with an aluminium or carbon fibre carrier to keep the weight down.