Actually, if the brown rust is coming from between the strands it can indicate a serious problem with the rigging
IIRC. Stainless steel is just that... stain less...not stain free... and it will rust, especially if it is either deprived of oxygen or exposed to certain chemicals.
If the rigging
is swaged, then I would definitely want to closely inspect the lower swages as they are the ones that tend to fail first.
Re-doing the running rigging
isn't much of a problem...just a pain in the butt.
Major differences between CNG, which is primarily methane, and Propane is that CNG is lighter than air, and doesn't require the same ventilation of the gas locker that Propane does. Also, the pressure that the gas is used at is different, as is the volume used. Propane has a much higher energy density IIRC.
Why do you want a power winch
?? It might make more sense to get a manual winch
that is large enough to handle whatever it is that you want. The installation of an electric winch
requires you to run electrical wiring, and to make fairly large holes in the deck to accommodate the winch
As for heaters... it would be best to get a heater that uses one of the fuels
you already have aboard...either propane, since you'll be converting the galley to propane, or diesel. They have about the same energy density as heating fuels
go. Personally, I would go with a diesel heater, rather than a propane one.