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Jakes pictures of the twin cam bevel drive engine is very illuminating - it would have taken a Porsche master tech quite a few hours to select, assemble and shim the componants to spec - something that Porsche wanted to get away from when adding up the assembly hours to produce a financially viable car.
Beautiful engine design though - I hate to think what it would cost to manufacture today though
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This engine pictured cost 125,000.00 to rebuild and thats fairly cheap.
It takes no less than 16 hours to complete the cam timing procedure as the components must be surface ground for precise adjustment. These engines were produced when a single builder assembled the entire engine, the same way we do the process here under our roof.. No automation, no robotics, nothing less than human hands.
The IMS/Layshaft provides a means of inherent balance for the engine as well
The higher the surface speed of timing chains, the more they will wear and the faster the chain rails that support and tension them will wear. I'll bet that the designers also didn't "master link" these chains, so changing them can prove to be just as near impossible as the M96.
I';ll know all about it when I get the 2010 Cayman engine apart in 2-3 months.