Interesting.
There is a huge Z scale layout about 5 blocks from my house, Allbritton's Gotthard pass layout. It is well done but it never excited me.
Tom's work is very impressive (what little he has shown us). I do recall being very impressed with two Z scale dioramas I saw at the Philly NMRA show. One was a prairie grain elevator scene, part of the GC laser display IIRC. The other was a UP western desert scene with a tunnel. They were very well done, but not far enough from N Scale in my mind to make me want to take a plunge.
I was not totally correct when I said I would never build a RR in 1:285. I had thought about doing a "RR" in that scale or even 1:350 to match up available ships. I am following David's 1:450 scale efforts, as some day I may dabble with that. A WWII NYC harbor scene with Liberty ships, destroyers and a working RR in 1:350 scale would be awesome.
As I work in O Scale I am finding that I really like building in this scale, especially in the early rail period as one can make things operate just like their actual prototypes. Switch stands, working brakes, stub turnouts, wood ties, 4 spikes per rail, link and pin couplers, etc. all just like the prototype. I am also finding myself drawn to the P48 crowd. The idea of working knuckle couplers is just too cool for me (I know HO has the Sergeants). However, designing a layout in this scale to fit a mid sized space is a PITA.
As to people, modeling the Civil War can be tricky. While the Yahoo civil war RR group is an interesting, mutually supportive and friendly group of people, you have to watch out for the folks still fighting the civil war.
Once my ACW layout is complete, I plan to try some of these other scales.