Extrude curves from a sweeped surface perpendicular

Hi all,

It’s been a while and I seem to get rusty with my gh skills/understanding again…

Please see the attached image for what I want to achieve: extrusion to curves from the surface in a perpendicular way so it’s forming a waffle structures to this side of the surface. I think I might have used the wrong subdivide surface command here? Ideally if it can extract isocurve that’d be perfect, instead of segments…

Any help will be appreciated!!!

Please share the GH.