Ditto. Love the pic of the cottage Iskra, really works well. I've fallen in to the 'too much track/not enough space' (for anything else) trap as well, more than once, to the point I become bored with the plan, and have to start again, before I ever really achieve anything much.
For me the early diesel era, and a mix of green/blue locos, maroon & blue/grey carriages etc., but with limited space, mostly loco's of up to type 3 in size (class 37's being a favourite) and semi rural branch line, either based around Scottish practice or East Anglian - many closed branches there to get inspiration from - and I can use my class 15/16's etc.
I did think one option I might have would be to have a set track plan and scenery, but then have buildings (sig box/station buildings etc) removable, so that I could eg; have one set of buildings built to a GE design, and another set to perhaps a Caledonian style (or whatever), so the 'spirit' of the layout would work either way, depending on which loco's one wanted to operate on any given day. That said, classes 24/26/27 did all work 'doon' south very briefly which with some poetic license strengthens my idea about East Anglia as a basis!
But I must get back to initial (re)planning stage, before any of that happens...