again, appreciated. i think i'm 20mm too low with my measurements. is 135 to the first vent? this is good news as i thought i was too close to the frame. "almost parallel?" that's been my problem all day. since the vents don't actually follow any of bmw's curved lines i think that the vents will look good wherever you put them. symetry is the issue. I'm going to make a template from mdf/ hardborad. once i've cut one out then i can apply it to the other side. that said i'm pretty confident i've drawn them out reasonalby well.
I wish you all the best for tomorrow steve. Shame you've decided against the naca/nana duct. how you spell it depends on how much JD you've drunk!