Mate I can understand what your saying. Yeah there are a lot of conflicting story's regarding the setups , it's a forum not everyone are correct!!!
I have a 4x4 3 door and have had it in all states of tune, different engines and axles.
Do what the others have said , this is my list of recommended parts

2wd beam
2wd diff
4x4 arms (so u can use 4x4 anti roll bar) or 2wd ones if you havent got pickups for the 4x4 roll bar.
2wd hubs
2wd driveshafts

Then the front
4x4 crossmember
4x4 hubs , tcas, rollbar

That's what I reckon anyway , it won't cause any problems

Look I'm willing to help out big time, I see you wanted posts saying tight with money and I replied too.
I have 2wd arms with hubs on
2wd beam
2wd driveshafts

I don't want Alot , now I've had to move out my workshop and take everything back to my parents as I split with my ex and got rid of the house. Got so much shit and need rid of .
You and only you can have it all for say ..... £50
It all needs painting and bushes and gators so it ain't mint at all but driveshafts are that alone. So if ya want them let me know.

Im helping ya cos I know how hard it can be to gather stuff on a budget, I've done it, i built my rep which is near enough as good as a real one and it has taken years.