Personally I think they are worth more redone, and I wouldn't pay anymore for a fixed up old interior than one in bad shape. As I would redo it anyway. But some people do like the old look. according to:Price vs. Condition - Vintage Airstream
average condition is $4200-8700 and restored is $11900-17000 stuff working is as big a deal as what the inside looks like. check out the web site. and ebay to see what they're selling for.
But the bottom line is, it's worth what someone is willing to pay.
And being in Ca is an advantage as everyone pays to much for stuff out there.