Well it's now 2021, and still no CAD models of the entire Model 3 Battery, which is a shameHi, but in 2020 already no Tesla Model 3 file for the whole battery.
Does anybody meanwhile know?
Well that's closer than I was 3 weeks ago, now to just find the front subframe as well...Since this discussion was started, 3D models of both the Model 3 rear drive unit and the entire Model 3 rear subframe with suspension and drive unit have been shared:
Tesla Model 3 Rear drive unit EVshop.fr
Tesla Model 3 Rear Subframe and Motor
The subframe scan is from Matt Brown (SuperfastMatt), done during his conversion of a Jaguar Mk V using Model 3 subframe-suspension-drive and battery; however, he modified the battery configuration for his project and so probably didn't scan the complete stock battery.