The finish of the 'chassis' should be somewhere in the specification. Traditional 4 wheelers have a galvanised chassis, so my instinct is that the M3W is the same. Somebody on here might know. Not so sure about the wishbones though - somehow I doubt it. Traditional Morgan stub axles are not painted, or at least not in 2005 when mine was built!! The M3W stubs are at least nicely painted.
Tubes though will suffer from condensation inside in extreme conditions, so I would find a way to wax the insides if the factory don't inject wax inside.
As a compulsive fettler, repainting suspension parts has never bothered me. It's a relaxing way to spend a weekend........sad but true.
