lately i've been making t3d prefabs, quite nice to work with compared to copy/pasting brushes from another map. this here is an escalator i made ages ago but could never use in game because there was a weird thing with falling inside of it when it was 40+ individual brushes. now it is 3, i decided to accept i couldn't make it 1 individual brush because it just will not intersect cleanly, so instead it is 1 side and 1 stair, stairs come in 128/192/256/320 heights, and then the sides are 5 different widths 16/24/32/40/48 (+8uu or 16uu for the sloped bit but that was part of the stairs to begin with and i couldn't be bothered to change the names). so they can be fit nice and snug into a variety of places. i only needed the 320 version for myself, but since getting it right the first time was the real battle (so many times 'order to last' to stop weird intersect lines wrecking it), minor edits to get duplicates in multiple sizes only took about an hour, so is nice for other mappers to use easily.
bit devastated my sshots are so dark, not sure what i changed, but i swear it is like 25% - 50% brighter than that on my monitor
no they don't work as moving escalators :( i have it conceptualised in my mind, using 7 or 8 loop movers, but yeah, probably not going to happen. they serve as just stairs really