Looking for the X and Y distance between the CENTER of the PEM nuts (for the leveling feet). It’s a bit tough for me to measure given the weight and awkward angles, I was hoping to get digital measurement from someone on the C3D team with access to CAD drawings of the XXL.

Thanks @WillAdams. By my math that would be 38.38" in the Y direction.

Also, I found a Y direction measurement here on the stock XXL Waste-board drawing which is 38.32".

So Y = ~38.32"

As for X I’m assuming in the same drawing that the PEM Nut is evenly spaced at 19.05mm off of Y+ as it is off of Y- (not illustraded) so that would give me 43.29" vs the 43.25" I measured.

As a hint, the Shapeoko was designed in metric and I expect that most measurements are a number that finishes by 5 or 0. To be accurate, I would make my measurements in metric then assume that it is to the nearest 5 or 0 due to an error in measuring.

Well that was made for conversion so that you could machine something metric size for those who had only imperial collets. You could also say that my favorite tape measure has metric on one side and imperial on the other or even a caliper that has both measurements but in this case, it is a unit that is engineered with both measurements. There have been cases where this type of issues the Mars Climate Orbiter was one of them. Designed by two companies, one using Metric the other Imperial and it was a costly mistake.

Yeah, since an inch was redefined as 25.4mm, some things come out exactly, so in this case 40" == 1016mm, so no huhu (so long as one doesn’t assume the 6 is an error and clip off a mm).