For non-californians, Non-op is not an issue as long as fees have been paid each year. Non-operational means that it is not on the road that year. No licence stickers, no drive. However the CA DMV is aware of the car still ('in the system') and makes transfer quite easier than those cars not 'non-op'ed'
BTDT in CA with CA and non-CA cars, non-op, what-have-you; not too much hassle, just have to have the right papers and signatures.
Rust around windows (silly work blocks eBay, cant see right now) can be fixed with a simple door/hatch replacement. Did this with an expired-registration Supra with rusty hatch. $40, pick-n-pull, one truck for transportation = no rust. If the rust is in the windshield area, look elsewhere, it may be a coastal vehicle which can often disguise itself as a midwestern experiment in rust.
Good luck,
Eric G (Iowan moved to CA, me knows the rust!)