See attached screenshot for a better explanation.
The lines drawn around where I need the extrude are done in 3D sketch with weldments for the tubing. I've managed to do this before to get an extrude of a few mm thick without any issues, except it was all straight lines and no curve in the glass. This time, there is a slight curve, and it doesn't want to do what I need it to do.
It's essentially a slightly curved windscreen. Are there ways around this problem, or any better ways of modelling a curved windscreen given I already have the base and roof to attach it to?
Thanks.
Try to use Filled Surface (or Boundary Surface depending on your curves and need of control). Then Thicken to get the window thickness.