There is some challenge to the mirror build, but it really wasn't that bad. Once the hardware build was done, I labeled all the connection points just like the manual says. On the mirrored Paramour I only had to reverse two of the terminal strips. That was 16 - 20 and 21 - 25. These ended up being labeled right to left instead of left to right. The two tube sockets just have to be labeled what they are, you can't transpose the tubes.
I actually built both amps at the same time. I would solder one wire or part on the "correct" amp and then make the same connection and solder on the "mirror". At each step, I stopped, pondered, considered, reconsidered, and re-read the manual until I was certain that it was perfect.
The C4S upgrade actually simplified most of the build and I wish I had just put it in to begin with.
Since there is at least one other Paramour I kit out there in the wild maybe this will help someone who is giving the mirror look a consideration. Since I had purchased my kit second-hand, I wasn't too worried about voiding the warranty. I knew it was up to me to get these babies running.
This experience has gotten me studying the Paramount underbelly. These would mirror along the short edge and not the long edge like the Paramours. Somebody has surely tried this already. No?