How to get panels into VCarve Pro 7.5

[JAZZCNC]

When cut, the shape is always about 1mm to 2mm out and not dead on.

You won't get them any better than that using this method without getting deeper into it like Silviski mentioned .!. . . .or drawing them from scratch.
BUT I don't see the problem here.? Get your basic shape imported then tweak the error out in CAD. It's a one time deal after that intial first import and tweak you have perfect templates.
You don't need to waste material for the intial test just put felt tip pencil in the spindle and draw out the shape and compare against your original template. You see the error and it takes 5mins to correct and away you go perfect parts every time.!!

[martin54]

As I said on the vectric site, easy enough with a good photo, I've recently done a front window for an airport bus from 6mm acrylic because they couldn't get hold of a glass panel for several weeks.
Both front windows were same so used the one that wasn't broken, masking taped round the edge to give me good contrast, took photo, imported photo into software, drew round the edge to give my shape (don't generally use an auto trace) & plotted the shape to a large bit of paper. Cut out the shape & compared to original window, was a bit out in one or to places so noted where & made alterations to nodes. Plotted & cut out again but was still a little out on one edge so repeated the procedure & third template was spot on.
Your panels aren't fitted to the vehicle so you could draw on new stock with pen as Jazz has said.