These VP's all have the identical Primary Load Structure. The secondary structure is what determines their difference in appearance, and this is where you can use your own ideas. For a Super-Quick Build some builders fly the primary structure alone; no cowls, canopy, turtleback, fairings, etc.
Then they design and build lines at their leisure. Some, after years of flying, completely remodel the lines rather than build a new airplane. Nebraska (above) is a remodel after 10 years of flying the Standard.