link Here is a link to someone who has done it---I have done it to my 03 Dolphin LX also but do not have pictures.
There are a number of past threads on this subject so do a search.
If your husband has wood working skills and some tools he can do this. I did not find it so difficult.
Basically just remove the old TV then decide how to mount the flat screen. Usually it requires custom making a backer strong enough to hold the flat screen mount. There is some figuering to make sure the TV sits properly in the opening. You have to think through how you are going to remove it in the future---things like that.
Then you need to trim the TV opening so it looks nice.
One thing for sure---get some help when you remove the old TV they are heavy.
I'll check back on this every once in a while---I could talk you through it but someone will come along who has done an 04 Bounder and have pictures. They would be the most help. Good luck.