It's a lot of work. A lot of work. I've got mine completely apart and am (finally) putting it all back together. There are many opinions and methods of insulating. Same with wiring. My wiring is in very good shape, BTW. IMHO, the only way to get the smells out is to completely gut it, clean it and put it back together. You also get the oportunity to check the "health" of the frame an so on doing a Full Monty. I'll be replacing many of the interior items due to wear and smell.
You can see my thread here. It's a long thread, but maybe something helpful for you there.
Uwe's thread is here. Great work and a lot of inspiration:
JCFerguson has some beautiful wood work and designs here:
Malconium has several very good threads discussing in good techical detail many of the processes of a complete rebuild (insulation, new floor, etc).
NorCal Bambi has some great ideas as well:
These are just a few of the people that I take inspiration from. There are others that I can't find right away (Moogie32, a-merry-can), and I certainly don't mean to leave anybody out.
It is a lot of work, my problem is that I don't nearly enough time to work on it. I'm ready to take the think camping!