Try going to
www.coloradok5.com . They have articles on all of your questions except the turbo.
You could do a shackle flip on the back to lift it the additional 4" and only need to buy new front springs and shocks.
Also, it is possible to run 15" wheels on 1 ton axles if you grind the front calipers. Check out the article on coloradok5. I would recomend running 15" wheels because you have more choices for tires and they have the safety bead. This will help prevent popped beads if you use your truck offoad much. I have 16.5" wheels and have popped tires off the bead offroad numerous times.
There are other cool ideas on about disc brakes for a 14 bolt rear axle.
They even have an article about your frontend swap!!!!
www.coloradok5.com