basic car body tutorial-2,....
now join all 4 surfaces mirror em so you got both sides and it should look something like this,
select dup edge cope the edges shown in the image and join em since we need to use this as a profile curve,
now draw 3 more profile curves somewhat like mine, select sweep2rail and select the edge curves, this is needed since were going to use the tangency to make everything again flow nice and smoothly,
now, of the front is a bit too smooth, select the first profile curve and rebuild it with more points, mine originally had eleven so i made 20 out of it, i dont know if you see the diference but it is there,
what i now do is select all the curves, selcrv, and move them all to a differnt layer and turn it off, except the ones that show where the wheels are, i need to keep those, cleans up a bit

select dupegde and copy all the edges shown in the image and join em,

split the car and the curve in half and delete the left half of the car, now make the edges of the curve on both ends longer still folowing the edge curve of the side and top surface,
select the curve and select the pipe tool, now if you want a normal fillet just make both eds same size but i chose to make the front of the car more round and the back have a more crisper edge,

split the pipe out of the surface, and delete the pipe and the split out surface,
now blend the surfaces together and it should look something like this,
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