[karlusmagnus]

It does look very nice indeed. Headliner is original as you stated and not ratty in the least. Has AC as well. Just put on a belt and then get it working. If you can hold onto it, you should. The esthetic value alone, just looking at it, during the cold months of winter in your garage ... ahhh .... I do the same myself ... just looking at its curves and shape. It would seem like you could get this up to snuff rather easily, in order to show it off at its best. If you are still wanting to sell, then you should get a good price.
Also post on early911sregistry.org forum for advice and info. If you go over there and search for "jade" and "bert" you should find a really nice car that bert jayaskera (sic) restored which was a jade color, with original paint, for the most part. Or look for user "fryardds" for his car, "patrick" which was also an original unrestored car. Only unrestored once. Having said that, some of your car has been painted, but still only some.
Also there is a car for sale here recently, an irish green 69T by JLandreth. Look for it here and over on that forum. Gives you an idea of value for a nice car. He was asking $20k, and still leaving money on the table. Times are also not what they were 6 months ago, so if you could wait this out a little, get her sorted, you would be ahead of the game.
Best of Luck
Karl.