Might do a little reading on four link set ups.
I always thought these were better for straight line duties as opposed to twisty stuff.

Neil - I heard about that IRS setup ages ago didn't realise it was you who was doing it - although i should have guessed!!

Is it a major headache? or something a backyard mechanic (me) with some professional help could achieve?

I'm not affraid of the work or cost just the difficutly level involved.