Good idea but a reliable head
Good idea but a reliable head gasket on a boxer engine is not rocket science - BMW and Porsche have been doing it for over half a century. Only Subaru's engineers could get it wrong, keep getting it wrong, try a new design and get it wrong again. They could have called BMW's or Porsche's parts department, said send us a head gasket, took it apart to to how it's done, and presto!