That truck is home made, you can do anything you want when you are building something from scratch, when you have to make it work where you have limitations that is a whole different story.
I haven't measured it, but I would say that the track on that twin I beam is at the very least four inches wider than the one in your Chevy.
What are your expectations with your Chevy? Taking on road trips, driving it on weekends around the town, daily driver? What are your expectations?