Awesome progress! Glad to see your past the paint portion of your build. As far as painting in your garage goes, I have painted several cars on a dirt floor barn. Yep, you will get some dust in your paint, nothing that won't buff out pretty easy. I only painted one in an actual paint booth, man was that nice! The last one I did I used my buddies portable home made booth, it worked pretty good too, just had trouble with my feet sticking to the plastic on the floor. check it out.
LINK HERE