I'm working on US Stone and Costner trees, and well as some work on the Crewson (my wife's) family tree.
One interesting genealogical note is that I grew up in Minnesota and my grandparents on my mother's side died when she was young so while I new a lot of my father's side I knew little about my mother's. Later I moved to North Carolina, and my mother was researching her side of the family and it turned out they came from not far from here.
In any case much of what I have started from family books and was supplimented with data from ancestry.com and my heritage.com. The source notations still reside in the GEDCOM, but it seems it doesn't make any sense to load people already here and merge if the existing Wikitree information has already been researched.
My strategy is to find the oldest relative NOT already in Wikitree and export GEDCOM's for them and their descendants and link that "sub-tree" to the existing profile that is there. It would seem that would reduce the workload for merging, and I would concentrate on filling gaps.
For those of you that have been on the receiving end up uploaded GEDCOMs does that sounds like a reasonable approach, or should I just upload the whole thing and commence to tag things for merging?
