I have an old door strip that needs to be covered with trim, unfortunately it is not very straight. How can I "build out" the trim that I need to put in place? I'm considering a masonite board or something similar that you place underneath where the trim doesn't reach the other trim. Thanks in advance!

This is how it looks without trim: At the top, they are edge to edge: While further down, it's not as good:
 
How much does it differ?
 
Per J said:
How much does it differ?
Between 1 - 3 mm.
 
A masonite is 3.2 mm, but today thin HDF/MDF boards are probably the most common, which I think are 3 mm. Works on one end, but perhaps it would be best to find a material of about 1 mm that you can build, for example, 3 attachment points with. However, I have no tips... Wood, plastic, elastomer/rubber... should work if you can just find material that can easily be sawn or cut.
 
Yes, the piece you have placed in picture number 2, I call it a filler (salning?).
And you could make the filler wider. So that it aligns at the "worst spot," and then let the casing conform to the wall?
 
Oh, so it's the lining that is in place but not straight that's the problem.

And I suppose removing and putting the lining back straight isn't an option, but it looks like a significant gap in the miter there?
Masonite is easy to split with a knife to suitable thicknesses. Just shim underneath. And place the last lining at an angle, so it looks straight...
 
Or you could saw it at an angle (3 mm narrower on one side). Any hardware store can probably do it for you for a ten or two if you don't want to do it yourself.
 
Lightning, I think you believe what I believed until I stopped believing it and wrote my second post about what I now believe...
That it's the lining you see in the first image that's crooked, not that it's crooked against the "wall side without lining."
Splitting such a wide piece like that isn't done so easily, not in the direction I think you mean... ;)
 
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