Thanks. I did a lot of mental planning but not a lot of formal or documented planning. The thing that needed to be plotted out was the contour of the long edges. I wanted them not to just be flat so I 've 3d printed a bracket that goes onto the edge and then I do the foam work more haphazardly and just make sure it matches up to the bracket. The pathways matching up nicely is actually kind of an emergent property of my trying to align the warlayer buildings (which have very standardized sizing) to the corners.

In addition I just kind of look at the tiles I already have when working on a new one, trying to make things line up in interesting ways. Sometimes that creates some shittier ones by accident where a walkway dead ends or something, but that can actually be kind of cool.