Rent a heavy duty gantry frame and heavy chain fall. Hook up to the stump and pull up on it as hard as you can. Then start cutting roots using the old chain saw chains, axes, hand saws and shovels and pry bars. Every time something breaks loose a little bit tighten up the chain fall. You would be surprised how fast and easy 2 guys and a bit of sweat will get that baby out. A couple of hours at the most.
I have done this for large interior trees and old roof gardens
http://www2.northerntool.com/product-1/200276024.htm
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Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways - Beer in one hand - Nacho's in the other - body thoroughly used up, totally worn out and screaming : Woo Hoo, what a ride!
