Just stumbled on to a drawing of the Picatinny Rail Mount.
This is also a Weaver mount, but the groove dimension is .180" for Weaver
Part way down the page.
Double click on the box & it will go full screen.
It can also be found under Mil Spec M1913
I've been making my own scope mounts for years & this drawing would have saved a lot of time checking mounts I had on hand.
Did take the time after I made a few to make a gage. That was a BIG time saver.
How close did you guys get w/ your drawings?