Hey Cafe
OK - this one should be slower ! And only the 30 steps to get through :)
Here's an interesting one. One of my favourite modellers in the world is Arrimus on YouTube. He does video requests over there, and recently showed how he'd make this Art Deco Spiral Staircase in 3DS Max. So props to him for inspiration !
Now, we don't have sexy Max tools like 'generate topology' that he used, so we have to go a different way. In R19, that's very easy now, and this alternative C4D method is 'almost' entirely procedural (and with a few changes would be 100% so !) so retains key advantages over the Max equivalent. So you will need R19 for this, but if you have that, let's get in there, and start with some splines...
CBR
PS I expect a bollocking from @VECTOR about this one, but trying to preserve quads on a Voronoi fracture is a fart in a hurricane, so that's my excuse ;)