I've wondered the same thing. I'd hoped Reality Composer Pro would allow me to look at the file and see how it was created, but that's sadly not the case. I may be wrong, but I think The Hab was also created in Reality Composer, before Pro came on the scene. I'd love to see more from the team about how it was created and assembled it. In my short time with both, Reality Composer and Reality Composer Pro feel way more different than I assumed they would. I'm a little frustrated that "Pro" doesn't seem to offer many of the options of the base Reality Composer experience.