You said in one of your postings that you want to put it together as a 2wd for now then switch it back to 4wd later.
This in my opinion is a very bad idea. You will get parts set for the two wheel built or by from a wrecked truck that will not be used in the 4 wheel drive set-up. Like the rear drive-shaft. You will have one made for the 2wd application which will need to be shortened when you go back to the 4wd. Just using up time and your money.
Don't get so excited that you start throwing money and time at this thing.