Mike two things stand out to me. The A/C is the first one, boy I wish I had it in my shop, and second is that due to the size of the shop, clean up won't take long.
The overall arrangement looks very good and your being able to work during those long cold winter days in Houston sounds good to. I'm not so sure that the term "long cold winter days in Houston" is really applicable, being from Alaska I wonder about you Texans, you don't know about real cold. Joking of course. I've been in Texas for eleven years now and am beginning to feel discomfort when it gets down to 20 degrees.
By the way, thanks for taking the time and doing the effort to get the photos for us to see.