I will soon be getting my 2002 LS 430 Ultra back from my mother-in-law when she voluntarily gives up driving. I bought the car when it was 3 YO and sold it to my in-laws in 2008. Silver with the ivory/grey driftwood interior. It has just over 111K miles on it and needs a bit of work but nothing too major. She has taken great care of it overall and it's in southern MO where salt is not an issue.
You have given me some great ideas to ponder. I want to keep it and drive it and bring it back to as new as possible, but I also love the idea of updating it like you have done. My only concern is that I have the nav, which really dates the car when you are inside. Would love any suggestions anyone out there has.