I have the second Allspark Almanac so I have that scale chart, but is there one for alternate modes or one that has incidentals like Highbrow and Rattletrap? a reason I'm asking is that I'm getting back into drawing and want to do the Animated characters without having to constantly keep my Almanac(s) open, and they only have a robot scale chart.
I don't think there's a scale chart that includes extra characters like that. You'll need to make an inference based on scenes they're in from the cartoon itself. I think Highbrow, for example, is a bit taller than Ratchet but shorter than Ultra Magnus.