I've started work on a 7mm scale model of the original FR observation 'Barn' 100.
I'm approaching it as an enlarged 009 model, using the same styrene technique I employ on my 4mm carriages, only a bit bigger.
This much bigger, in fact....
Somehow it's always a bit of a shock to see how much larger a 7mm scale model is than a 4mm counterpart. In the shot above is the first of the sides for 100 and spare 009 coach side I have kicking about in the bits box.
Because 4 is more than half of 7 I suppose I think that a 7mm model will look less than half as big as the 009 one, but of course the enlargement is in all dimensions - length , height & width etc - so the actual space it takes up is much more than a little less than double.
(That was quite a complicated way of putting something that someone with better maths skills than I would express in a short and simple equation.)
Just so you know, I'm using 30" styrene for this base layer and the detailing will be done in 20". That's 50% & 33% thicker, respectively, than the sheet and strip I used on a 009 carriage.
It's the first 7mm carriage I've built so hopefully I've guessed right on those sizes and it will be rigid enough.