If you want to design a yo-yo I would recommend investing in some calipers and taking the time to measure them for yourself. You never know how accurate someone else will be about measurements.
This is coming from a guy who knows what he is doing. I did this myself, but seeing as I don’t trust myself with this kind of thing, I am 3d printing a test yoyo to make sure I got the measurements right. I would recommend doing this the first time you design a bearing seat based off of your measurements.