Youngsters probably don't know who Izal are, and that makes them very lucky indeed!
Izal toilet paper is thin, slippery stuff that smears rather than wipes. "Popular" in public conveniences and outside facilities years ago, it had no redeeming features whatsoever (go on, someone come up with one) and is one of those products that convince me that "the good old days" weren't as wonderful as misty-eyed old folks would have you believe.
Peco Wondeful Wagon kits were a clever way to produce easy to assemble kits to bolster your fleet when the RTR world offered a limited selection.
Embossed card sides fold around a plastic core, and the result isn't bad at all if assembled neatly as as been done here. The chassis and wheels were good for their time, and passable today if you aren't an underframe obsesive.
One day, those couplings will have to go, but I'm not sure if they will be replaced by tension locks or Sprat & Winkles. It all depends what sort of layout this makes an appearance on. I quite fancy is sneaking on to a "proper" layout one day.