The pins of the board line up on a perfboard. That's how I originally calculated how many pins to use as distance. I think the problem was that I was working using the Pixel UOM instead of inches, so my pins were wrong (I copied the svg from the Fritzing template of the IC).
PCB Measurements:
The board has three "sections" - SV1, SV2, and JP2.
SV1 is the bottom 2x25 header looking at the board with the power jack to the left.
SV2 is the other 2x25 header at the top.
JP2 is the 2x5 header on the left.
Pin 1 of SV2 is 21 holes above pin 1 of SV1.
Pin 1 of JP2 is 3 holes down and 1 hole left of pin 1 of SV2 (top header)
So, in "code"(I hope this is right):
1 SV2
.........................
.........................
..1
..
..
.. JP2
..
1 SV1
.........................
.........................