Brian, your photos fit right into our precedence of a loosely defined "What did you do on your layout ". These support your layout, so this is the place! All looking good!!
Ceramic tile. I have enough ceramic tile for my layout room, given to us before our daughter made it into an art studio. I am inclined though to just paint the concrete floor and put down that rubber flooring sections in areas I would be on my feet or knees. The ceramic would sure look better, but...