I was going to bash it, but then I read the thread. I'm impressed by the custom work put into that kit. Still, single Turbo>twin turbo unless you can't source a single turbo big enough to flow enough air for your needs. Up until recently I wasn't convinced, but even the Mustang guys with engine configuration conducive to twin-turbo setups are going with big singles and advised against a twin-turbo setup.
But he realizes that, and he's doing it to be different, which it is.