Of course I do not mind, I even encourage anyone to use any part of my MOCs or MODs for ideas - like I do with creations of other LEGO builders.
I have been building for a couple of years (not very intensively), but I just recently decided to share my creations, so that others maybe get some inspiration.
I think sometimes even seeing a rare color (like the reddish brown car) on a simple build can be interesting.
Motivation is different for each build, sometimes something is badly missing in the city (TV and Post van, the blue small car which is bigger than a Smart), or I build a complete model around one or more details (like in case of Porsche or the nose of small bus and telephone van), sometimes I just have some leftover parts to build around.
Some of my creations are not photographed yet and some builds are in progress, I hope you'll like them.
As far as Porsche is concerned, I also find the front blocky, I just cannot go on experimenting indefinitely. It is just an unusual build, it is robust and is visually close to what I expected, so I just stopped now. I think a build is never really finished, there is always place for improvement especially as TLG regularly comes out with new molds - just think about the possibilities with the new Cars parts.