The ETA site has all of the manufacturing info for all of their movements here.
Simply select the movement, whose date wheel you plan on modding, from the drop down lists. Then download the "Manufacturing Information" PDF for that movement.
A few pages into the PDF, you will find all the dimensions for your datewheel, including tooth platform angle, tooth spacing, wheel size, number centering and spacing, font sizes, and pretty much anything else you could possibly want to properly layout your date wheel overlay or even manufacture a complete datewheel.
You may also note that the CP dimensions, and other useful info for you franken nuts, is present.
Have fun
Simply select the movement, whose date wheel you plan on modding, from the drop down lists. Then download the "Manufacturing Information" PDF for that movement.
A few pages into the PDF, you will find all the dimensions for your datewheel, including tooth platform angle, tooth spacing, wheel size, number centering and spacing, font sizes, and pretty much anything else you could possibly want to properly layout your date wheel overlay or even manufacture a complete datewheel.
You may also note that the CP dimensions, and other useful info for you franken nuts, is present.
Have fun