Very nice!
You know, my Dad taught me a trick on sanding drywall when I was putting the finishing touches on our workshop. Did you know that you can use a heavy duty course type large sponge, dip it in water, wring out the excess, and more or less wet sand the mud joints for a faster, neater, cleaner sanding job?
You can also use some old athletic socks wrapped around a cut off 2x4 and do the same thing. It is amazing the difference in sanding speed, no dust, and smooth walls. You have to be mindfull not to soak the wall (the natural clean paper portion of the open drywall), but to work it nice easy and smooth.
I have actually considered getting truck bed liner spray in a large quantity in white, and blasting my house garage walls so that it would be smooth, textured, and water proof.
Looks great!
Chris