Received the replacement cylinder in short order. Kvetched on the circlips for a bit. They just take some squeezing and coaxing and they pop right in. Yes, they are awkward. Filed the compression rings to .018" per Brian Nallin. Scrubbed the bores of the Millenium cylinders with hot, soapy water per Wiseco's instructions. When I wiped the bores with an oily paper towel in preparation for inserting the pistons, it came away grey. Oops, more cleaning needed. The oily paper towel seemed to be the ticket so I just kept wiping until no more grey.

At this point, the cases, rear and lower mounts, tranny, shifter, cams, cam cover, cylinders, and pistons are installed. Oh yeah, oil lines and battery box too.