20' CC -Whats the value?

[erebus]

In my neighborhood there's a 1971 20' CC for sale that I've been keeping an eye on, but the owner is asking what seems to me to be way too much.
The boat has apparently been for sale for several years now, and hasn't been used or really maintained.

I checked her over the other day and would like to maybe make an offer but I don't want to be too insulting. The current asking price is in the ballpark of $6k.

Here's the condition:
Decks are pretty rotten. Soft all around the console almost all the way back to the transom. They've been coated at some point with some kind of roll on nonskid to cover the crazing, and the coating is peeling back because of all the water trapped underneath. You can push the deck up and down with a fingertip.

Console looks OK, definitely 40 years old.
Bow rail, trim, etc would all need to be re-bedded or outright replaced. Screw holes filled and hardware re-fastened.

Transom has some cracking at the motor mounts, and is probably in the same condition as the decks, but cant be sure. I didn't look at the locker lids too closely seemed OK.

Bilges are very dirty and most wiring looks suspect. I'm sure the fuel tank looks similar.

Lots of dings and battle scars on the cap and outer hull. Gelcoat is chalky and has some bad repairs, but doesn't look too awful. Lots of gloppy marine-tex.

Motor is a 1988 Johnson 115, looks it's age. As do the controls, gauges, cables and wiring.

Trailer is in fair condition. Probably also late 80's vintage like the motor.

I work for a local boatyard and can handle pretty much any boat repair task, electrical, mechanical, glasswork etc. So I know I can fix whatever I find. I also will have some downtime this winter.
I just don't want to get into a project boat at too high an initial cost.

What do you guys think would be a reasonable offer?