Here is a great article about recarpeting:

http://www.bassresource.com/features/bass_boat_carpet.html

I basically followed this article to put in my carpet and it has worked well so far.

For the fish finder, I am a little out of the know since I haven't shopped for one in a few years, but I'll put in a word for my Lowrance X91. It's been good to me so far. The Pinpoint graphs are also nice. Maybe someone else more knowledgeable can chime in on the graph info.