I did a rear bumper with a swingout carrier as my first project. After 50 hours I stopped keeping track of the time. I started thinking about how much my time was worth per hour and whether or not I was saving any money doing it myself. Luke's rear bumpers are my favorite for 80s and 100s. I also think it is cool that he is doing the kit thing. Save on shipping and cost but you get a production quality unit that you can mod for your own needs.
39" Spare OUCH! I'd hate to have to lift that baby up and I'd hate to think of what that will do to your vehicle length and departure angle and rear visibility, even with the huge tires on the rig that is going to hurt.