More great photos @Gilbert
Actually, it's a good idea, and a standard practice of mine, to not fix all buildings into place until I've "tweaked" things a bit.
I've usually got a good idea of composition of structures on a layout - but sometimes just moving one or two structures around,
a little bit of repositioning, and sometimes crucially..... leaving one or two structures out! Can help improve the composition and look or atmosphere in a layout.
I mention "leaving out" structures here, because as I've often said - less is more (or can be)
I liked the portacabin, it's well made & painted - but I think that end of the layout looks more spacious without the portacabin.
Of course, you can always re-introduce it at some point.... possibly even with some other scenic items that "sit well" with it?
Or possibly in a slightly different location?
Keep tweaking the building positions - and do it maybe whilst shunting some stock around
Sometimes the presence of a loco or wagon just add to a hut being in one position or another. Anyhow - you are at a stage where such "playing" is great fun,
and your layout seems to grow each time you make a decision.
Another note here - with something like a Portacabin, you don't really even need to glue if permanently in any one place....
Perhaps keep it in your stock box, and add / remove / reposition it at will.... on a whim, depending on mood etc
Looking fab Gilbert. If only I had time to do some modelling.... this would be among several layouts on here which I'd be looking at, to inspire me