OJ,
Symmetry is not what you get but what you make it.
After just 35 restorations, done back when I was a pup, I started to realize that you had to make it
look right - but not necessary
measure out right.
Templates/patterns help determine how far off, but I only need things to look
right.
Although - I had one tough customer (aviation hall of fame AND automotive hall of fame, and etc etc) who made me template the whole car and make it all symmetric. And re-space all the hundreds of rivets. Tough job, endless nitpicks.
--and then there is the optical "conclusion" .... happens when it measures out but never looks right until it is tweaked.
sigh.