I've not heard of a steel baja style fender. There are several makers of glass fenders for these trucks. Some seem to have better luck than others, but all take a little massaging to get to fit right. Obviously, you have to remake something for the inner fenders as well.
In the rear, it's a little more extensive. From what I understand, it requires separating the inner/outer skin of the bed by drilling out a bajoogle of spot welds. Then, the outer skin is replaced by glass. Usually, the bed sides have to be supported at the back end as alot of the structural rigidity is compromised.
A guy on compd recently modified his rear fenders to flare out for drag application. He cut a couple of the supports around the rear fender area, and used a jack and some wood to carefully persuade the fender to bulge out about 3 - 4". It actually turned out really well, and I'd definately consider this method for a truck that is still going to be used as a truck.
--Eric