Dimensions for this plastic tray that comes with the R3 Uno?

I'm delighted by this new little plastic tray that comes with the new R3 Unos. I'm trying to 3D print a little thing to attach it and a battery to.

I can't find any mention of the tray on the product page, but I'm looking for a 3D model, or 2d layout of the holes somewhere. Anyone have a link?

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