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Not to be a pest... but if the cams are going to break based on spring loads, what's the prevent them from breaking after you get the valve cover/cam bearing cover off and before you install the bracing tools? If there was a risk of camshaft breakage, Porsche wouldn't have designed the engine this way since they wouldn't be able to assemble the engine without cams breaking.
With the engine set to the correct timing to ensure the middle cylinder isn't on intake or exhaust stroke, there should be enough support provided by the cam bearing adjacent to the drive sprockets (the one that isn't integrated into the cam cover) and the factory cam lock tool at the slotted end of the cam (not a home-brew tool that fits loose enough to allow the cams to lift out of their journals).
I was able to lower the back of the engine enough to get the 1-3 bank valve cover off. I disconnected the main air intake tube to the throttle body to prevent breaking it. This was with the suspension installed but the transmission removed.
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