I filled the transmission with fluid this evening and changed the fuel filter while it's easy to reach. I did those things while waiting for the body filler on the cab corner to dry so I could sand.
I KNOW it isn't a great job, or even a good job. But it's my first time doing it, and I'm happy with the results. I used some seam sealer in the gap between the rocker and the cab corner, just like factory. I worried most about the side where it will be seen. The back isn't bad, but it isn't perfect either. The bed will always cover it there. At least it's better than if I'd just stuffed rags in the rust hole and bondo'd it up like most do to these trucks. A few coats of primer and some sanding, then some paint, and the cab will be completed.
I have high hopes my shifter will arrive tomorrow. Once it's on and my cab corner is painted I'm pretty much ready to set the cab on. I'm getting excited about that.