Primary minimum gauge/scale here is still probably Gn15, but O9 has been around for as long, possibly longer, then there id G9, which is attracting more interest. I have been dabbling in 1/32 scale using 9mm gauge track, and have been thinking about 15in gauge in the same scale using old TT gauge stock. I did buy one of the basic Tillig sets but track radius as not small enough, and it was surprisingly difficult to find anyone Peco selling 12mm gauge track.
I have now bought some 12mm gauge track, some S/H Triang wagons and some German TT locos, as ell as some very nice finer scale wagon wheels from Germany, so have no excuse not to start. I have looked at some 3D printed wagons , but there was a problem printing them. I think some of the 5.5mm scale 2ft narrow gauge wagons look about right for the bigger scale, if not then I can always use them for smaller gauge.
I think 1/32(or 1/35) makes a nice mid way scale between 1/24 and 1/43, and am surprised it has not been used for minimum gauge before. For those wanting to model miniature then British TT scale is very close to scale Greenly 15in , is 1/3rd scale locos on 1/4 scale gauge track. Although I have not checked properly, I do believe there is quite a lot still produced in kit form for British TT.
I am thinking of a 'pointless' layout, either some type of pizza, or one with sector plate or transversor, not sure yet. Would like to fit it in an APA box of course.
Narrow gauge Francophile interested in 1m, 60cm,50cm , 40cm and smaller gauges . Build in scales from 1/6th to 1/24th. Also 1/32nd and 1/35th using 16.5mm track to represent 50cm and 60cm gauges. http://www.rue-d-etropal.com