Hi - What is the best way to create a geo with all interior filled/connected polygons?

To test I'm trying to use copy on a grid, then was going to write some vex to connect the copies. Is there a simpler way to do this?

I'll need it to be more than just a box (like a pig head - second image), too - basically any shape with all interior connected polys.

Connected how?
Something like copy cubes on points, fuse (Fuse SOP) and deduplicate overlapping faces (Clean SOP)?

Yes this works - thank you