Brick Pattern on Doubley Curved Surface

Hi Everyone, 

I'm struggling with figuring out a brick pattern for a doubly curved surface. I'm trying to shift the Bricks by some distance using the evaluate curve and the wireframe of the existing surface. Any suggestions would be great. The GH file is a bit messy, but the part I'm struggling with is defining the correct vector to translate the iso trimmed surfaces.

My goal is to move these along the lower curve of the surface 

Any suggestions would be great, thanks in advance. 

Omri