Hi,
Thanks for that.. these things happen.
Now starting over again.. What is it exactly you want. If you have the modules presumably they already have the holes in the bottom. Therefore it should not be hard to work out the base plate hole locations.
If you are asking what are the dimensions of the dual Maxi base plate I can tell you as I have one and am happy to measure for you.
Let me know if that is what you are after.
Cheers
Ray
NZ