The good folks at Areae gave us a tool today to wet our appetites while the Metaplace platform cooks. It's an isometric wall builder, the current version is 0.41.
More info here:
Here are some early experiments with the tool that I've done, hope you like:
I put 1-pixel wide lines at the half and third marks.
I know they look huge but each one is only 4-6kb, so there's a bit of breathing room.