This is a hollow cube with drain holes on the Z face and breather holes on the opposite face (build plate face) to minimise suction. Stick it on some supports to lift it off the build plate (Don't have it with the base on the build plate, that negates the breather holes and can ruin your FEP/PDMS), print it and measure. It has internal supports in the hollow space already, so none are required there.
When I used this on my Moai with v1.15 firmware, using "m" as the relevant cube measurement, the formula to calculate what entry to put in the relevant X or Y entry is:
I haven't used it on my D7 yest, but I'm sure you can work out what formula you would need to use.