You can do that wiring/install yourself. Mostly just running harnesses from cab to roof to power and such. Brackets are pretty universal or make your own for the screen. 

You wouldn't need a brown box if you're using a newer "monitor" like 2600, 2630, etc. 

So just the ATU and appropriate steering column bracket/spline, display with AutoTrac on it like 2600/2630, and receiver on the roof like a 3000 or 6000. And the greenstar ready harnessing to connect and power those things. Ag Express or JD has the harnesses, some are cheaper at AE, some cheaper at JD depending on what you get/need