The Nearby door manufacturer sold me an Oak replacement sill with all the pre-routed channels for the metal tracks and the proper bevel, so saved me a BIG hassle!
Now I'm crossing my fingers about what I find underneath the old sill.
Taking the door panels off looks pretty straightforward.
If I don't find any subfloor rot, then the hardest part may be properly fitting the new sill under the old upright sides of the frame to match the original....especially if I will have to add a sill pan/H2O barrier.
I'll try to take pictures, and make this thread more informative as I go...
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