I'd imagine you are correct, wootdawg. But I think there may still be some benefit to seeing teardowns of the other 2 models, because it's not 100% clear (to me, at least) from the iFixit teardown what options exist for upgrading or replacing the hard drive.
I would consider buying the 1 TB HDD version and replacing the HDD with a SATA SSD and PCIe SSD, but I'd want to see a step-by-step guide to doing so before I took the plunge.