I will then release the structure from the car and trim to shape before attaching to the car in final form with bolts, as you can see in the pictures I have the wing uprights (these will be scrapped as the dragon design is a bit lame imo) positioned pretty much where I want them to be - I will use the alloy uprights in the pic as a mold effectively to get the shape of the mount - I plan to make new uprights in Carbon sheet as you can see on the picture of the white car. 

So I could mount to the channel but if I did the wing mounts would effectively splay outwards by a few degrees rather than facing directly forwards, I do not wish to do this - 1, because it just looks odd and 2 because I intend to have solid plate uprights rather than machined frames, the reason for this is that I understand that plate wing mounts not only have less drag than frames but also have a stabilizing advantage compared to frames like the dorsal fin of a fish or the tail fin of plane - they are both solid and facing directly forwards for the purpose of straight line stability, this is an effect I wish to achieve the wing mounts - so aesthetically and dynamically I feel its important they face directly forward rather than splay outwards as they would do if I mounted to the boot hatch/ quarter panel channel.