Looks like it's buried in some ISO norm and no one ever managed to get a copy of a drawing out of there.
Via google I can find nano sim contact dimensions and also some mini to micro relevant specs, but nothing from nano to micro or nano to mini.
Thank god for norms and paywalls, right?
I adjusted the title, maybe someone has had more luck than me. I tried for 10mins and gave up.
PS: I'd get a couple of card photos (not drawings!) from the mini sims into a paint prog, the higher the resolution the better and then start 'counting pixels' vs. what the outside dimensions of those cards are. Some math and you will get there.
Or as they say where I come from - Mühsam ernährt sich das Eichhörnchen.