The thing no one has touched on yet is the extra cost of a 2 phase kit. The second phase will have to be crated and shipped not sure where you are but lets say that is a $1500 added expense. Think how much further that money would go to extras instead of being spent on a crate and freight. The added benefit is that some of the assembly is better done while you can put the body on and off a few times to check fitment as you go. Also keep in mind that IF you wait a bit to order yours the all steel 33 will also be available. Having seen the Beta steel body at SEMA if I was in your place the steel option would be the way to go. The upcharge will be somewhat offset by a cheaper cost for body work and paint when you get to that point.
HTH
Dale Berry 7liter Hemi33