Korm,
As luck would have it, I don't have the software on my computer to run the vids. I did learn something important: on the large engines/streetcars (?) the center set of trucks slide laterally for curves. This opens up interesting possiblilities for my LR tramway.
I'm just daydreaming here, because this is a long time in the future, but: when I get the main layout 'finished', I really really want a tram to deliver coal/small whatnots to all the industries/sites. Now, the mine RR will be 18" -- S ga -- and the layout will be tight (or full, depending on your point of view) but I do want Light Rail freight. I'm guessing at 12", still in 1:20 scale, the tracks of which will weasel between and around and across (or under) where necessary, the other three guages. (45mm, O, and S = .808 ga) I forget what O ga is, but its major reason is to provide dual gauge trunkline with the 45mm. Everything will be the same scale, 1:20, thus NG by definition.
So, you can see that very narrow track ga is necessary, and also tight radii. But challenges like this, and building an x-4-4-x for the trunkline are the sort of things that light up my life. Besides, I'm almost besotted by the creations over on the Microscale board. That's where the sliding truck caught my attention.
Now, back to the point of this thread: about a year ago I discovered the Japanese paper construction and glued up some file folders in order to bend, work and whatnot to see if I could build something. While they were drying, someone came and moved them and they disappeared. The frustration was immense, and I swore I wouldn't try anything else until I had a place to work on trains where they were unmolested. (I found the sheets while cleaning up downstairs when preparing to actually start on my RR). Three or four sheets glued together seem to approximate light gauge aluminum--the 'feel' as I bend them in the brake is about the same. And that's as far as I know. Well, I wouldn't hesitate to use paper, but it'll need bracing and likely, some care in handling the finished article.
Les