1990 Wellcraft CC 20, 1995 Mercury 225 hp

I'm going to look at a 1990 Wellcraft CC 20 (21?), T-Top, GPS, trailer, 1995 Mercury 225 hp on Saturday. I haven't talked price because its a friend of a friend's but I know he paid around $13,000 2 years ago. Sais it's had little use by him as he had twins right after he bought it...used as lake boat by him. Guy he bought it from apparently had it as a second boat so he thinks lower hours on it period.

What should I look for? What are some good hul integrity checks? What is a fair price if in good condition?

Thanks in advance! ???