Problem with tesellation object to surface

Hello,

I want to bring the hexagon volume to the surface but I can’t do that with my code. My goal is to build
some kind like a parametric wall with tessellation hexagon voxel to the surface. Please advise me. Thank you.

VoxelWithKarambaSurface4.gh (17.9 KB)

Start here:
https://www.youtube.com/results?search_query=grasshopper+brick+wall