With the new frontier tileset, measuring is child's play.
Keep in mind new raster to play with 12 x 12 units ... 144 possibilities!
1st example: 4 walls directly behind each other, you simply select a grid unit on the frontier floor and move it one unit with the frontier foundation from the centre to the outside. Then 2 units, 3 and so on. The centre is marked with an auxiliary element.