What are your goals and intended use for the truck?
I'm sure it can be done, you can plop just about any vehicle on top of Rockwell axles, it'll all more or less the same amount of fabricating.
It's not like you're trying to make the axles fit under the truck and tires in the fenders and look normal are you?
It'll be a reasonably slow truck, still.
What did you have in mind for power to turn big tires? Or stock engine and rely on the low gearing to putt around?
Grigg