Your tree will be a piece of cake, very little tension. I would make the first cut at the first limb and then work toward the roots.
One thing that will save you a lot of work, sacrifice a grain or two of the heart wood and split off your bark and sapwood like you would doing a belly split, saves hours of draw knife work.
I would definitely split off the outer parts of that gnarly base, not worth the time trying to salvage every ring of heart wood on that beast.