Hi Gary, here is another area of the model that has that "not tangent" problem, you can see this one just by eyeballing it:





That's a sharp area where those pieces meet, there's about a 12 degree difference - you want these arc pieces to be a full 90 degree arc for such things so that the top of it has a flat horizontal tangent so it will be smooth where it touches the top line.

These little creased areas are much more difficult for filleting to process, it will actually have to try to fillet that little crease as well and try to put in corner patches in the pieces around it and stuff like that.

If you can get those arc pieces to be smooth where they touch the lines that would help out for filleting a lot.

- Michael