What do you use to cut through a pumpkin with that much accuracy? Just curious.
There is a kit you can get at Target, Walmart, etc. It was like $4 and had a book full of designs and a few tools. The main tool is a small saw that is basically a fine toothed jigsaw blade mounted on a handle. It also has a little wheel tool that you use to transfer the design onto the pumpkin. I found that tool a pain to use, so I went and grabbed my wife's seam ripper tool and poked all the holes myself.
Then you just take your time with the saw, and keep the original layout handy to make sure you are cutting out the right pieces.