there are several cool blocks newer blocks we can use.. but.. they don't line up with the older thin walls.. I think by now the easier solution would almost be to make the walls a bit thinner than to modify all later added block shapes. In my screenshots are a few examples where you can clearly see there is no consistency between the different block types. For future block shapes to be added, I urge the devs to look if they line up nicely with existing blocks. (added bonus of making walls thinner; we would be able to walk between double thin walls and the sorts.)