I cannot do something like this, so if anyone out there is able to, it would be much welcome.
The thing is that 3D floors have made it possible to have 3D platforms which are able to move up and down (like in most modern games), but Doom is seriously lacking the same thing, but for horizontal movement. While it can actually be worked around by making bridges and stuff, actual moving platforms cannot be made whatsoever. An actor moved by camera interpolation points can somewhat emulate this, but it's not perfect and the player has to still "walk" on top of this actor to keep him/herself on top of it.
So here's the deal:
Making an actor similar to fake 3D bridges would be the key for this. Adding it special native properties to keep the player "attached" to it while it moves (like a moving sector), and give it arguments to set its path through path nodes or patrol points. That would make actual horizontal-moving platforms possible. Then, giving it an appearance would depend on the modder (be it sprites made for it or actual 3D models).
Adding something like this will really expand what can actually be done in a map.