Hey, you know that 1 layer of dirt under the town road? Yeah, I want that to be diggable so I can put a wall there without it making my underground area 59x59.
The general idea is that you have a 60x60 residence to do what you want, so it may not be a possibility as a feature. However, you could try and ask a Snr. Staff to do it for you for a price if you supply the blocks.
well, it might be possible to code it so that under the walkways is sandstone the whole way to bedrock...