'67 Valiant: Rebirth

Well, we did some tape-measure measuring tonight. The numbers are a lot closer than I expected.

Left-side front-to-rear: 56 1/2"
Right-side front-to-rear: 56 7/8"
front side-to-side: 31 11/16"
Rear side-to-side: 35 1/8"
Right front to left rear: 65 9/16"
Left front to right rear: 66"

Our measurement methodology probably wasn't the best...We just clipped the tape measure in one hole and ran it over to the other hole, measuring to the edge of the hole. The holes we used were the closest ones we could spot in the subframes to the wheels. Estimating center to center would have added even more human error. Is there a better way to do this? How do the numbers look so far?