I am a retard and it took me 20 years to figure this out!...
So you want to make a Pirates CSG Computer game.
and you have the cards.
Punch out the card and scan it into the computer.
Use a simple 3d modelling program that can save in .obj and texture of UvUnwrap.
make a plane and unwrap the texture of the punched card you made before onto it.
Stretch the texture to fit over the plane.
Make sure the plane matches the rough dimensions of the Card.
Start cutting around the white sections of the texture.
Once you have cut around a single section and save it as its part type in a different file.
Undo untill you are ready to start to cut out the next section.
Rinse and repeat until you have completely cut out all of the white sections of the cards and saved them as a single file each.
bring all of the pieces back into a new file and they should go into positions you cut them out of the original texture card.
Time to apply the unpunched and scanned card texture.
Now select all visible surfaces and extrude a proportionate amount.
Remember to close the objects by closing the under surface of the object.
Using the UVunwraps for the top side you can make the bottom side look similar.
You may want to scan the back of the card and use it to fill in the underside textures.
save it as a completed file with textures.
Now start to translate and rotate the objects into a position so it looks like the constructed models in the CSG.