I know at least in my area you need a permit especially for a sign of this magnitude and for the permit one of the most important thing you're going to need is a CERTIFIED engineered drawing. This drawing, which I can guarantee will look nothing like what signtronix, will contain the proper specs for to ensure the sign is installed to code and to be certain nothing fails and kills someone. Not to mention, there are a lot of complicated steps, crane operation/excavating/footings and concrete work/mounting the poles and sign/electrical hookup/sleeping at night, that would take a great deal of observing and hands on training to be confident enough.