That's awesome.
I used to love doing gauge needle and number detailing on 1:24 plastic models, but now I'm like most folks and can't even see the gauge let alone the markings.
My metal relief art was many times that size, I can only try to relate with brass pressure gauge's clockwork experience, lol.
You graphic design is very clean and professional, not just good, very good. (on a pro- level, I need absorption time to say great/epic and really mean it. Unless you did by hand vs digital )
But who paints on pin heads anymore? .. teasing. Pin heading with trains was just not for me; N was too small, Ho/OO barely cuts into acceptability.
Other scales bash and build more partially because it can be much cheaper. More details can be skipped too (though with YOUR work, that may not be true "α"). The builds can be radically different too. An etched/scribed line may surfice for a seam in Z, while in O your more likely looking at actual panel joints.
Small scales always seemed to have more kits available.
Another aspect is that O is "the collector's scale" and toy scale. Folks that want all things a touch more simple or hefty and reliable, often look to O (or S or Standard, etc) because those are the trains that were 'indestructible' traditionally and easier to work with based on size alone.
My Gramps used to note he was a Lionel collector and operator, not a modeler. He ran trains that real train modelers had produced.
Because there has never been a whole lot of abstract toyish looking small scale. It has always been the modeler's domain since the inceptions. Even with low cost production and growth, the perception was established there along with the more real RR per foot, and real curve ratios as an attraction, making them the "natural" choice for serious modeler's willing to work with smaller models and the lack of need and limitations to some detail.
Then there is that third rail too. Most of us are too lazy to pull it up, or deal with polarites and relay blocks.
I think O scale build crowd produces a lot more one off CARS per individual. Not weathering, just custom or specific exact cars, odd road names, total fantasy, etc. done by individuals. (Exacting scale not implied either) A lot more building material creativity happens as bashes grow in size. Look at some of the common household items used G scale bashes. (I like fun innovative stuff like that )
Finally, I'm thinking the % of REAL modelers in the other scales seems higher because the total population of "jr scale" railroaders is way higher. Just look to the 2rs & 3rs sections of the forum to see some other inspiring endevors.
Alone at it or not, I'm all for seeing more.
Step by step photos as you progress, in your own thread or in "what did you do on your layout today", would go over well imo.