Thanks for the write up! I just used it to replace my D7100 mode dial.
One caveat, in step 19, there are no screws under the circles that are drawn. Those screws were removed to get the LCD off, I ended up removing several other screws (some unnecessarily I believe) before I was able to get the top panel to separate from the main body.
There are 2 screws on the sides that definitely need to be removed as they clearly hold the top panel to the body. One of these is visible underneath the strap retainer in photo 18. The other one is the same location on the SD card slot side of the body.
edit - I’m also unsure why this shows how to remove the LCD from the back plate as this is unnecessary for replacing the mode dial.