Don,
I'm with Fumblin all the way. It took us more than 10 years to get our truck done. When it finally happened we did the lion's share the work in about three months. We piddled with mechanicals from time to time, but my dad finally decided enough was enough - it was time to DRIVE the d*mn thing. He worked hard to get it done and got us motivated to do the same.
Sometimes, you gotta walk away until you are ready to hit it again. Other times, everything comes together, you get inspired, and you're back at it. Seeing all the success stories here helps.
It's OK to park it for a while. Better yet, since you've done so much work on the mechanics, just drive it awhile. Hit the lumberyard and fill it up - get it dirty and have fun; you don't have to worry about the paint job!
If you do decide to sell it, chances are you'll never get your investment back. I agree on the paint issue also - one of the fun aspects of working on an old truck is making it uniquely your own - I personally would rather have a truck I could paint the way I wanted it.
Here's another thought. If you have a community college that teaches auto body nearby, they might have the students do your exterior for cost - everybody wins that way.
