Just to add to Guy's info - fibre optics don't like sharp bends - the light escapes at the corner. You can deliberately let light out along the length by filing a small nick. In one monumental model railway project I got involved in, it was noted that you could get more light into the fibre if that end was flat, with a conical profile. This was achieved by heating the end and tamping it on a flat surface. To get the max light out of the other end, just heating to a blob worked well. This was pretty much pre-superglue, and LEDs were not that common back then. The input ends are best commoned into a short length of drinking straw which can be a push fit over the LED/bulb, and painted black.
1:75 figures are near enough 00 scale, 1:72 are slightly larger people, H0, 1:87, pass muster as smaller people. I, and probably everybody else, are to the same scale as our neighbours, but we are rarely the same size.