FF3 and suspension bracket

[voucht]

Hello,
I have a concern about the front frame, and I'm wondering if I'm completely wrong, or if there is something I missed ?
If the front and back face of FF2 and FF3 are respectively parallel to the front and back face of FF1 on their lower part, and if the top part of FF2 et FF3 are square on each face with FF4, then the outer and inner face (leaning part) of FF2 and FF3 can't be parallel to the outer and inner ends of FF1, as their base section, when cut and put flat on FF1 is a rhomb (see 2D sketch below). Stop me now if I'm wrong.
FF1-FF3Problem.jpg
But if I'm right, how the axis of the suspension brackets attached on FF2 and FF3 can be parallel to the central line of the chassis, as the back plate of these brackets should be welded on the outer side of FF2 et FF3 which is NOT parallel to the centreline of the chassis ?
On the 3D view, the axis and back plate of the bracket is parallel to the centreline, and the back face of this bracket cannot be plated to the outer face of FF2 or FF3. There is a gap, as the two faces are not parallel.
My guess is when you put the suspension brackets with the rigs, you cheat and fill the small gap with welding. Does not sounds very good to me, but I might be worrying for nothing.
GapOnBracketAndFF3.jpg
Could anybody who has already been to this point please explain what he did, and the magic trick ?
Thanks a lot.
Regards.