I just did a quick look - there is actually a You Tube series on this kind of set up. I didn't watch all of the various videos, but they seem to start out well. Might not all be relevant or well done, but some interesting stuff :http://www.youtube.com/watch?v=eXjGu8gy6DY
Before you commit to hair pins, make sure you know the difference between them and 4 bars and what each will do for the suspension. Light cars do fine with hairpins, heavier cars, probably best with 4 bars. It has to do mostly with caster change and possibly
with axle twist/frame deflection and maybe
even weld integrity.
And yes, I know that both are used with good results.