How should I tile this shower?

Shower in question. It's been covered in Kerdi (horrible process, lol), water tested, etc and just needs tile. I've been putting this off for months. I'm gonna get started on the back wall first and will probably do it over a few days. I have a ledger that I am waiting to attach.

Tile is 9x12 (with 1/8" spacing) for the walls and 2x2 for the floor. I'm using unmodified thinset per the manufacturers instructions. I want to do a half overlap/offset pattern. I have bullnose tile for the sides. Total height is 83". The first and last row will be about 7.5" high (so they're even and because maybe the base and ceiling might not be level) and there's gonna be a 4" accent tile strip near the top.

Anyway, I'm not sure how to set the pattern with that weird little space to the right of the bench on the back wall. It's almost exactly two tiles wide (24") and 18.5" tall. Since the first row will be 7.5", I can fit a row of that shortened tile, a row of regular tile, and then the next row on top of that I'll have to take off a corner when it hits the bench. I'm not sure how I'm gonna do the 1/2 overlap there, though. Maybe two full tiles on the bottom, then go from there?

The way I was imagining it was like this: 4" for the fancy accent row, so 79" left over. So, 79"/9.125" (tile height plus 1/8" spacing) gives me: 8.657. So that's 8 full tiles plus 5.913" of a tile. Add that 5.913" to 9" = 14.913, divide by two to give me 7.456" for the bottom row and the top row so they're the same size and because they'll likely need to be adjusted since I'm an idiot/the house isn't perfectly level.
So, that'll be seven rows of whole tiles (63.875"), two rows (bottom/top) of 7.456" tiles (14.913"), then that 4" accent row (which I'll probably insert before the topmost row) = ~83". Does that all make sense?

So yeah...any tips will help. I've probably posted about this before but I'm kinda nervous about getting it all right so go easy on me please! Thanks!