That is really nice work! Me likeeeee!
With respect to the bundling and derating, I gotta rant a little here. How many fires have actually been caused as a result of improper or non-existent derating?
I fully understand the heat issuese, but let's face it, I would rather see an installation like this, than a rats nest all over the place. Chances are if wiring is sloppy, it is more likely to be dangerous too. With outstanding workmanship like this you know the rest of the job is as good as gold, rendering any negative effects from the lack of derating almost non-existent.
Derating could also apply in those nice neat bundles we make inside panels too. But I still think those nice neat bundles beat wiring all over the place anyday.
Also, we don't know if derating WASN'T taken into account... how do we know those cables weren't upsized?
Anyway, enough of the sideshow... nice work!
Joe