Finished the crank polishing. More crocus and finished up with some 15 micron diamond paste. It's good enough for me:
After polishing I re-measured the journal and now I get 1.1798" with 0.0002" out-of round. I couldn't ask for any better even if this was a Honda crank. Then I had to measure oil clearance even though I don't have plastigauge:doah:. I ended up doing it the old-fashioned way with a telescoping gauge and micrometer. The target was 0.0025"-0.003". I got exactly 0.0027" every time. I'm glad Karma is taking it easy on my first build...
...that is until I go to put the rings in the piston. The oil ring separator and top comp ring wouldn't fit in their grooves. Turns out my own cheap :asshole: is to blame. On the NRR page for the piston it says "for standard size use -801 rings" and "for oversized pistons use -003 or -004 rings." The standard piston on that page is a -800, meaning it takes the newer, thinner, -801 rings. The oversized pistons sold from that page are the older -000 type, meaning they need the older, thicker, -003 or -004 rings. NRR only sells the -801 rings in standard size but the -003 rings can come standard through +0.030". The -003 rings are also about $5 cheaper than the -801. Thinking the standard -003 would be the same as the -801, I bought the -003.
Long story short if anybody needs a set of 13010-Z4M-003 rings, I'm your guy!
A picture of the amateur hone on the bore: