As I read through your ratings I could immediately recognize the work of someone with an engineeering background, which I verified by reading some of your other posts.
Kudos from another engineer/guitarist/lover of fine watches for a job very well done; it was a very well done, most thorough analysis. Nice axe btw, bet that has tone for days...
Only point on which I would disagree is availability of preowned 15400s at the $8600 price point. I keep an eye on those and haven't seen one close to this point, they are typically priced in the $11-12K range here and in other forums, occasionally down into the mid 10's.