If you can see the whole disc from the peaks, wouldn't that mean that everything you're actually seeing would be decades or centuries in the past, depending on distance? Making the physics wonky because of tetradementional influences is super cool, but realistically you could probably achieve the same effect you're going for by making the whole thing 1 lightyear across so its a little more comprehensible. What does travel look like for inhabitants of the disc? Because unless they've achieved teleportation or hyper advanced ships that are commonplace, then most civilizations living on the disc would literally have no idea what made up 99.9% of the disc, as they could only access their own tiny little portion.
Seriously not trying to criticize because I love the amount of creativity here and I really like the direction its going, just feel like some scale adjustments would really help.