Hey there!
I want to design a 3d printing part for the dashboard of my golf 6, more precisely the top middle part right 
.
I am somewhat experienced with designing parts in fusion 360 for daily usage, but I don't really know how to design this part.
I did try getting a fit for the front arc and an arc from the middle front to the middle back, then did construct a plane from both arcs and did round the result on both back edges. But I noticed when trying the fit, that the dashboard top is not really symmetric, but has an additional bump to the left.
Do you have any tips/guidance/ideas on how to get a better fit? I did think about scanning it 3d with some lidar device, but I don't have an iPhone and wouldn't know where else to get a device.
This is gonna sound really dumb, but get something to make a negative, like a putty or foam or something. Make a negative of the contour, take the negative and trace it on a piece of paper. Scan the paper with a fax machine or scanner from a printer. Export that as an SVG, import it into fusion. Messure you negatives size and scale the image to the negative. Trace the line of the image in fusion.
This will get you within throwing range of fitting.
The problem is, that I need to get some sort of heightmap mesh, not the form of it.