[boxhead]

I will supply a tip that I have used and can vouch does work.
The fibreglass that most of our cars are made of is flexable, it can be heated with a heat gun (these can be bought at any hardware store) and you can "adjust" the body shape.
Example being my sills.
The R/H sill on my CR had more waves than Bondi beach, but over the period of 1 week, I systematically heated the sills and clamped long straight lengths of 4x2 timber to the inner and outer edges.
I did this each night when I got home from work and allowed the glass to cure and cool down over that night and the next day.
Here is a before picture,

Looks like I forgot to take some during the process, but you can see that toward the front the sill rolls under and tapers down alot, this is were it was very wavy.

I will be using the same process to push down the leading edges of the cockpit where they slide under the door, also I will attempt to put more curvature in the leading edge of the bonnet, it sits about 2mm low in the centre.