I think you'll find re chroming to be very expensive and while I like the bike, it would be a hard thing to justify spending all that money on. If it were me I wouldn't repaint it or replace the decals. That should clean up very nicely with the finest grade of steel wool and a light touch with wd-40 saturating the steel wool. WD-40 is a crappy penetrating oil, but works great bringing out the luster on old paint. A amin ingrediant is fish oil and it is also useful for bringing back old leather. I think new paint and new decals, new chrome and you will have less, rather than more. That's just me. It isn't a new bike and is nicer because it isn't and has age and wear giving it character and history. I've experimented some with cleaning up lightly rusted chrome with fine steel wool followed with clear coat. Seems to work pretty well, but time will tell. The price is right...
As for the rusted chain, it depends on how badly it is rusted. Does it not want to track around the sprockets because it is rusted together or does it function ok, but looks rusty? If it is mostly cosmetic you can remove the chain and soak it in motor oil. When it has soaked well, perhaps for several days, remove it and clean the excess oil off with a rag. If the links all seem to work freely you should be OK. If some want to stay stuck together you can work them loose, but might be better off buying new chain. Once you strip off the paint you're committed to a lot of work and may end up disappointed with the result. I would suggest trying some restoration on a small section and see if you like what a light touch, fine steel wool and WD-40 can do.
SB