I have a pretty firm grasp on this technique, so I'll answer some questions
Ok awesome I've managed to do it fairly easily, Pretty nice and tech and for a change its actually easy to do and will probably just take a few days to get used to doing consistently.
I usually have my c-stick set to tilt - does anyone if its possible to do a sliding d-smash (we calling it that?) or sliding smash without the c-stick?
Yes. You can actually do the technique with no input, by simply letting go of the joystick. Your character will slide while standing. You can do anything during that, including down smashes without the c-stick.
Can't seem to figure out the timing, someone plz assist!!
Never mind I just used my brain to figure it out. Basically the only kind of movement where one can do a dsmash is you either Stand still or walk. The reason this works is because you are really entering a walking mode after turning, at least you fool the system into thinking you are because you hold a direction on the stick. But after a slide you are really running (which is why forward smash won't work with this). Which suggests that this is unintended, or in a move to give the competitive community an advanced maneuver, a kind gesture from sakurai.
This is not how it works. If you let go at a certain time before you start running, you will just slide while standing. You can do Foward smashes with this, but you need to let go of the joystick before you press the C-stick for some reason.
Basically, to practice this I would first work on doing it by just turning around with no ledge. All the ledge does is give characters a boost for some reason. Just do the turn around, and let go of the joystick just after you start moving forward again. Timing varies for different characters.
What slides is the same as whatever slides with perfect pivots.