Size charts for several of the species. :) Each sheet had three characters that took all of 2min or each sheet. They were done on very small pieces of paper; no bigger than post its.
There are of course weird things going on here; mostly head size, if the head is too big there's an "s" pointing to it to ensure that those are made smaller on actual models.
Here's Geoffrey's finished size and clothing chart. Antoine is next then Tails and Sonic. :D