The inclined floor is an issue with the Holo Me creator I believe. It just rotates the camera so it appears everything is slightly tilted.
Walking around the cockpit seems otherwise normal to me. (Outside Holo-me)
Floor height should not be much of a relevant concern, as ED to my knowledge is not designed to be a roomscale game. All it's interested in is your head position, which normally should match the head position of your pilot.
Turning the IPD on your headset having no obvious visible effect on scale is normal. SteamVR (or the HMD itself, I'm not sure) takes care of adjusting the scale of rendering to match your IPD.
I think it should be reported as a bug. Both the scale issue and the inclined floor.
Only a portion of the users are reporting issues with scale. I haven't noticed any common factor between these users:
-Both Vive and Rift users have reported the issue, I believe. Though it seems to skew towards Vive users. However, not all Vive users have the issue. It's not strictly HMD dependent.
-Some people who have both have also reported having the problem in their Vive, but not their Rift. So it's probably not the physical size of their RL body affecting their perception of scale. (i.e. it's not a "fat people problem") Unless, I suppose, Rift has a larger, but incorrect scale that just happens to match these people's expectations? But that's probably far-fetched.
-Some users report a too small scale, while for others it's too big.
-The reported effects (like avatars looking like 12-year olds, or "pixies") sound too extreme to be caused by minor, expected IPD discrepancies.
-I don't recall any of these people having reported that they'd had similar problems in other VR games.