Oh ya, you can come up with millions of ideas for the truck. But I found it really came into focus when I actually got the truck home and sat there looking at it. Lots of time was spent with a tape measure and taking detailed notes. That way when I either went on the internet, or to a store, I knew what could and couldn't fit. There is a good amount of room in the back of the truck, but you will never be able to fit everything that you could ever need. My main objective was keeping it stock on the outside while making it as comfortable on the inside as possible.
Throw out any ideas that you have. Sometimes getting another perspective is good as someone could see something you didn't, or suggest another method of doing things.