This isn't a project for you unless you have some fab skills, IMO. You're going to need a welder, and various other fabrication tools, and you'll need to know how to use them. This is the kind of stuff that can kill you or others if you don't do it right (think nose-dive or steering breaking at 60mph).
What side is the front differential on... and what is the lug pattern on the axles? That would be where I would start to find a front axle that's a good match for your transfer case and rear axle.
Next step is to find an axle that matches up good, get steel and start mocking up your leaf spring mounts and figure out where to put things to match up with the amount of lift you want in the back and where you want the axle positioned in the front wheelwells. Cut off all the stock front suspension and mounts, put your leafs and spring hangers on and hang your axle.
After that you'll have to figure out what to do for steering, brakes, etc.