A current project is a great example. We are building a foot cart shaped like a large rowboat. We used the plasma cutter to shape the steel we needed for various parts of the primary structure. As we built the heavy frame it was an easy matter to have the machine cut the end covers for the forklift pockets to ensure the operator doesn't poke the forks through our decorative concrete in the front. The bottom plates for the fridge and the freezer were quickly cut from 3/8" thick plate. There is no worry they will ever rust out.
Once the welding was finished on the main frame we built a subframe of pencil rod. This was wired and then coated with the fibreglass-reinforced-concrete and carved as we often do. That workwas done in stages, tipping the boat on it's side to do the under parts. It just made things easier and quicker.
The plasma cutter again came in handy as we built the mast and upper rigging. It was so fast to measure the required pieces up and then let the machine cut them in seconds. Best of all they required little more than a touch of the grinder to make them ready.