Nice pictures! I am a big fan of Injectidry. You should consider getting a water separator to protect your expensive power head. The separator is about $150.
I also invested in the in line HEPA filter ($425) and was surprised to see the amount of crud
that had been going into my power head.
When I did wdr I had the opportunity to use one on a wall mural in a community center. We had an artist point out areas where we could drill that he could touch up later and not affect the integrity of the art work. Worked great. Saved the wall and the mural.