Pokemon Perler designs?

All around the web I've seen a multitude of wonderfully done perler designs based off the Pokemon universe.

I've re-done a few of them myself, which I have to say turned out nicely

My question is: how do the artists recreate these 8-bit sprites into a full 3- or 4-inch perler design?

I can't find any designs or sprites large enough to 'trace' on

Can anyone help? How do they do it?!
 
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