20mm scale is the military equivalent of 4mm/ft, they tend to refer to 1/72 scale and 20mm in same sentence. Similar to way 54mm and 1/32 scale are related. It is interesting how Airfix mixed up military modelling and model railways and on occasions put OO/HO on military modelling kit boxes. Some of those same kits are now branded as 1/76 not 1/72. Small difference in practice, far less than between 1/32 and 1/35th scale. And a lot less than what is referred to as G scale.
It is interesting in the model description of the armoured train that it refers to N gauge, when in 1/72 it would be a lot less, maybe using Z gauge.
I wasn't trying to put a damper on the challenge by mentioning what is mainly my own personal aim to promote Gn15 and this forum. I would suggest a twin approach so those who prefer small models can be included.
From the 'unfinished project' point of view, I will just say that I started a new (APA box based) project when I came back from France at start of September. In fact it was two separate boxes, albeit both standard gauge and one OO, one HO, and completed both by end of October, might have been earlier, and the HO one(Isle de Singe) has a 3 page article in January Continental Modeller. Biggest delay was waiting for some track items from Shapeways. By the way the OO one is called 'Monkey Island', and I will eventually get its article published. It was also a way to break away from the WW1 modelling I had been doing.
To complete any project, you have to be focused, not set the challenge too high, and be prepared to accept slight compromises. Having a fixed end date is important, which is what anyone building for exhibitions does.
I am lucky in some ways, not being in proper full time employment, but I am trying to develop my 3D printing business at the same time. The above modules were also part of that. I am also lucky now to get on well with some editors and some exhibition managers.
As I said before, I enjoy a challenge but hate competitions, I already have an inkling of an idea for a mini Gn15 layout fitting into a 15in by 15in square. Different totally to what Carl did with his original square foot module, but definitely inspired by it. I came across Carl's module way before this forum started, and owe him a lot in the way he inspired me over past few years, although the seeds had been sown years before.
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