This is a fun song to do. I found Willie Nelson's version on Ultimate Guitar but it just shows G and D chords. Very simple. Thought it would have more to it than that. Here's a spirited version by The Avett Brothers. 

https://youtu.be/v-kOKvJcp9I

YEE-HAW!!

https://youtu.be/sUML2yWVn8c

Another point. You can play a scale, C D E F G A B C, or you can harmonize that scale, C Chord, Dm Chord, Em Chord, F chord, G7 Chord, Am chord, C Chord. When you play those moving chords in that lesson you're actually using a harmonized scale. In effect the chords are taking the place of bass runs or melody notes between strums.

To summarize: Melody, feeling of movement between the two chords, swing it! (This is a dance tune) 

As for a guitar solo in the traditional sense, the classic Willie recording is a perfect example of simple melodic style. Again, working from memory but there is a break that is just some double stops out of the Gm pentatonic scale. This works nicely in the context of a boom chuck style, you can slip it in between chord playing just like a bass run or single note run. 

You can play a very effective single note sole on the GBE strings of that 5th position Gm Scale. It'll sound just like the simple electric lead on a Hank Williams recording. Once you get the feel of that part of the scale under your fingers and in your ears you're 80% to Chuck Berry but that's another story.

Hope this is actually helpful to you and not unsolicited confusion.

I did run across the Eldon Shamblin Lesson in my YouTube explorations, but didn't think I wanted to try that kind of playing now. Yeah, one of those barre chords he did looked like it stretched out over 5 frets. I'm not there yet, LOL.