How can I avoid or clean distortion in curves imported from SVG? I'm trying to create an image of a board (wood, silver, or gold) that is carved with some ornamentation, e.g.





The purpose is to create an imaging that will later be cut with a laser machine.
Therefore I first create the image in SVG, using inkscape (laser machine accept only VG), than I import the SVG in to Blender.

In Blender I grab only the ouyline, pull it down and create a Face (i.e. the board) and I use the rest of the part to carve through the board

I tried 2 method of carving through the Board - Knife Project, and Boolean Difference.

The methods works well when working with more simple structures, e.g:


But than other structure gets distorted, like in the images above.

My questions are:


Is there a better way to do it than the methods above?
How can I avoid/or clean the distortion in the image?


Edit:

As explained in How can I model Gothic style windows? (credit to ardito comment)

You don't actually need to separate the board and than curved it, instead:


open the SVG in InkScape and change the image to be filled (instead of only stroke)
import the SVG to blender 
select the important mash and do ALT C and turn it into a mash
now you can simply extrude it and create a 3D img with carved spaces.



unfortunately it doesn't work on complicated image, such as this:


import the SVG version of this image cause blender to convert some of the colors: i.e. black becomes transparent and vice versa.

If I tried to use the boolean difference than blender crashes.

the knife project seems to work - it took about 10 minutes to complete, now I need to delete about 100 faces - but this sometime fails to delete the correct face.
As explained in How can I model Gothic style windows? (credit to ardito comment)

You don't actually need to separate the board and then curve it, instead:


open the SVG in InkScape and change the image to be filled (instead of only stroke)
import the SVG to blender 
select the important mesh and do Alt+C and turn it into a mesh
now you can simply extrude it and create a 3D object with carved spaces.



Note: if the curve is distorted then select it, in the Properties editor in the Object Data tab, on the right, find Extrude and increase it by 1.