1) yes
2) carapils (dextrine)
3) light
4) use more cascade. citra, if you want an exciting twist.
5) just mash at 151. i'd personally use 8oz of corn sugar, and a bit less 2-row. DJ usually is not malty, but a dry DIPA. dunno why scott uses carapils, either. for body, i suppose.
lastly, use wlp...