-- to my regular model railroad interests.

I assume that TT gauge (1:120) would be a viable Sn30" for S Scale ...

... and that Z-gauge track (1:220) would make (at 16.5 scale inches) a viable minimal gauge (15" gauge) in S scale. 

Also >>>  Is O-gauge track a viable 30" gauge for LGB (1:22 scale) sized equipment?

Can anyone steer me in the right direction to get started?

I'm a standard HO'er but have started adding HOn30 to my layout (it may take 10-15 years to aquire the goal I'm about to state) and, it seems to me that the narrow 30" gauge trackage is MORE suitable for the quasi-URBAN scenery of my Euro/American waterfront scene.  (The streets, as planned, are quite narrow, with a lot of it under elevated standard-gauge trackage) -- this is a fairly busy North Atlantic port).

I am wanting to add both streetcars/trams AND industrial switchers, the latter which are readily available but the streetcars I'm not so sure about.

ANYTHING anyone knows about HOn30" streetcars (availability, scratchbuilding tips, kitbashing, conversion/adaptation) would be a welcome topic of discussion.  I hate to do a lot of scratchbuilding, and it seems to me that standard-gauge trackage is unnatural for narrow city streets -- especially with rural-to-urban narrow gauge (30") trackage already in existence on my layout.

Many new manufacturers, including Walthers' Cornerstone Series, have given us dozens of versitile, realistic, convincing structures for use on our layouts.  The Cornerstone Fire Station is a prime example, but many manufacurers are giving us better products than they were offering 15-20 years ago.

Yet there are some I'd love to see kitted that are not currently available (at least not in a believable form).

I am starting a thread listing buildings which I'd like to see made available by a manufacturer -- others, please join in the following ways: (1) Add additional buildings you'd like to see available, especially those which ought to be; (2) If you know of any structures availible that fit the bill, that someone has said is NOT available, please tell us about it.  We'd like to know.

Here are some buildings we need someone to manufacture kits for:

(1) County courthouse (needs only be about 60x80 feet, monumental, with a tall clock tower -- suitable for a town square -- can double as police station, sherriff's office, post office, or county offices).  With all the hype Cornerstone has been putting about railroads on main street in small towns, you'd expect to see a medium- to large courthouse with a tall clock tower offered by now.

(2) School buildings -- especially elementary and high school types. Any era, replete with 8-12 classrooms, gymnasium/cafeteria/autotorium or library space and school offices -- yes, these can take up space fast, but I am convinced that a complete school facility can be modeled in an area about 18x28 inches or less.

(3) Apartment buildings.  The Heljan Synagogue is nice, but we need apartment buildings from the 1920s and modern eras that mimick popular architecture -- be it the English/Tudor/Italian/Rennaissance of the 1920s, the concrete structures of the 1960s, the pleasant residential structures of contemporary times. 

(4) College buildings -- The train is how many commute.  Some foreign manufacturers offer post offices and industries which may suffice, but we need buildings without the tacky little stores on the ground level -- buildings which look like they could contain classrooms and dormitories.

(5) Modern (not necessarily contemporary-styled) churches -- medium sized churches will do fine.  I once pastored a c.1978 colonial style church in a small town in Alabama, with a small fellowship hall/kitchen and five sunday school classrooms -- it would make a wonderful HO kit, I think. Churches need education wings, not just a chapel.

(6) Contemporary drugstores, such as Walgreens.

(7) Small hospitals and medical facilities

I'm sure there are others. Ayone care to comment or add to this list?