Is there a way to align planes along a surface?

Hi!

I'm having a little problem here. I've been toying around with a tower definition I've made, but now I want to do some stuff randomly placed around the faces (I'm using FFcloud to get the points) and I've figured, -I might be wrong-, that I need to project planes on the XZ axis along the surfaces of the tower.

Now I have managed to do that, the problem is that the planes are entirely fixed on the XY axis and are not "attached" to the twisting surface of the tower. I think I have an idea how to do it and I'll be working on that now, but I'm not sure.

So my question is if there is a way to make planes to align along the path of twisting surface. I'm attaching pictures of one face of the tower and the fraction of the definition I'm working on.

Thanks!