I decided to try this experiment myself and I have a different conclusion.
Even though the cylinder is largely covered up, because of the cutaway, we can get determine it's size easily. And because we can make out Bowser, Yoshi, Samus and Kirby, we can correctly map the texture to the cylinder. When doing so, we get this:
It appears to be quite perfectly sized to repeat exactly once. The
height of the display isn't tall enough to accommodate the entire image, however.
This is interesting indeed, but I think that the banner seen in the leak is designed with the cylinder in mind... that long rectangle with the Smash Bros logo and the mural is probably intended to be positioned on the cylinder entirely, not only a part of it.
A detail that I noticed is that at the left side of the cylinder there are some black marks that I tought are the letters of the logo; if you put the full banner on the cylinder, that's where the logo ends (more or less), so it makes sense. (but I may be wrong on this because I already failed several times at figuring out the shapes from that blurry image, and maybe those aren't letters but Cpt Falcon and Robin).
The cylinder can still be functional and maybe the problem is only the "handmade" mapping. Maybe if they print the actual thing it fits well and the problem is just in the mock-up.
The point is, there are no measures in the leak, they aren't technical drawings, so we don't know the real size of the thing, we know approximately the proportions of it and nothing more.
Either way, there still seem to be the problem that the picture is cutted and does not fit well in height.
If we want to analyze it even futher, there is that dotted line in the inner surface of the cylinder. What's supposed to represent? The center of the surface? Or the lower border? either cases the mapping would be wrong, but as I said, the mapping may not count if it's just a rushed mock-up.
There's also the thing that usually those dotted lines are used to represent what's not visible, but the cylinder is supposed to be open (I think) and you should be able to see that line from that angle just fine, they should have probably used a normal line instead. But even this is not sure, because there are some software that generate technical drawings automatically, and those software can make errors. So, still in the case it's a rushed work, it's possible that they have used one of those software and generated the drawing with some stroke errors.
So, the possibilities are all open, though I wouldn't think about that too much, I would focus more on the fact that the original picture on the cylinder is insanely blurry and it's not due to the camera, it's intentionally blurry. That's the biggest red flag to me... it's ok to use a placeholder picture instead of a 300dpi picture of several GB, but even the lowest quality placeholder would have been of higher quality than that, and even the picture of the banner ripped from the leak itself, applied on the cylinder looks better than the original one.
That's really odd and personally it's an huge hint that something is wrong about all this,
along with the fact that the battlefield picture under the Smash logo is stretched and it's not somethning that a graphic designer would do no it's not, I was wrong, my bad.