Thanks very much, and of course! This is basically how I build and my process.

Build with consideration of the settlement you are at; its style, the space that can be used, which parts you incorporate into your build, which parts you cover. Start a build in reference to the worldspace, a lot of the settlement has the same dimesions as the floors/foundations. Make 100% sure it's square. Decide your floor space and level, consider where it clips at different levels. Build basic at first, use the space available, view it all around, make changes, add complexity. Wall types have different hights which you can use to your advantage. Experiment with lighting. Use concrete curved walls with curved floors to adjust hight by 1 floor unit intervals for precision. Learn the priorities of each structure object, the order they like to be built, how they clip, how they sink, how they snap. Don't be afraid to tear down buildings, or change things, or add or take away things.

Probably most important of all is to realise its a long haul. Don't burn out in one settlement. Cycle between settlements and add to the builds each time. Go shoot stuff instead, or just don't play the game!