See my workaround on this issue and some ongoing change.AndrewA wrote: ↑Mon Feb 22, 2021 8:59 amHowever the final design would need so room size tweaking. To do this I decided to use sketches with length constraints. As recommended on the wiki, I split the sketches up into smaller parts, linked together with external geometry. This also means that walls can be grouped by thickness and changes to the internal rooms change the external walls, keeping the ground floor and first floor the same size. However, some changes to sketches, like removing a line, change some of the names of other lines, which can break external links. There are also links to some external geometry of roofs and walls, eg for the ridge tiles. These seem to get the edges renamed very easily, especially when using another solid to cut out part of the wall or roof. If I was to do this again, I would look to find a better method do these links.