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Hi, really cool frame

I wanted to ask you how far apart are the mounting holes from the main shaft for the motors?

I don't understand how the 16mm and 19mm standard mounting distance works or means? I was thinking on using these motors http://www.hobbyking.com/mobile/viewproduct.asp?idproduct=86647

Also is it required or recommended to get a motor mount?

And where is that measurement of 16mm and 19mm come from?