Recessive white can occur with any base. Extended black is no more common in recessive whites than any other base. In my experience e^b is pretty common with white silkies--because silkies are usually e^b based.
The blue bird has a parent that is wither blue or splash, and at least one...
I would not say the bars on autosomal barring are wider. And penciled and quill are separate patterns from autosomal barring. B^sd is not cuckoo http://www.edelras.nl/chickengenetics/mutations1.html#gen_mut_secpattern shows all of these patterns except quill.
I have seen a lot of pumpkin birds at our shows (most of the shows in my area combine a game show with the regular show), and there is HUGE variation in colour. In game shows the colour standard does not seem to be nearly as strict as in regular APA/ABA shows.
I love the appearance of your...