Good job! Easy to forget the PRAM battery. Did you also get a foil bit to add to cut down on interference between the WiFi and USB? (one came with my Mac Mini HDD upgrade kit).
I did all of that except for replacing the thermal paste a couple years back when I got one of the last refurb 2012 2.6 from Apple. Added Apple care, a 1TB SSD and 2TB HDD, but didn't make them into a fusion drive (the 2TB HDD is shared and visible to both OSX and Bootcamp - the stuff/games I work on often is built for both)
An interesting thing I've come to note on all my machines, not just the mini, is that I really notice when I am accessing a traditional hard drive. All the machines let them spin down when not actively in use (2.5" HDDs are laptop drives and default to doing that), and there is a pause when they have to spin back up. Call it first world problems, but I've come to be annoyed by it, and whenever possible am going all SSD now. Most machines are getting a M.2 drive as the OS drive/primary work drive, and for 2.5" drives, the Micron 2TB SSDs are down to about $310 (under $300 when on sale) and I'm making them part of my new builds, compared to the Samsung 5400RPM 2TB 2.5" HDDs at $110 (which seem to be getting hard to find). Silly? Maybe. I'm probably spoiled.