All these each require different tools and skill sets, as well as China the mouse to use the right material or tool at the right moment. Certain materials, especially when working in thus tiny scale, like the foam and the corrugated card, can compress whilst cutting. The foam springs back. But the corrugated card won't necessarily do so.
There are aslo issues like knowing when to glue more detailed parts in place. I glued the matchstick and cocktail stick columns in place too soon. And without properly squaring off the internal corners, meaning that many of the columns lean rather drunkenly. Making the curved roof 'lights' (windows) on the uppermost roof (excepting of course the dome) was challenging. But I like how it's come out.
I had to stop at this point, not having anything to hand suitable for the dome. And then today I bought a few 10mm diameter wooden beads, sawing a small part off one, and passing a cocktail stick through. I reckon it looks ok!?
At this point I sprayed the building in Halfords grey, so as to get a better sense of what I had so far. All the different colours, materials and textures were making it hard to really see the building clearly. I realised some time before this that I'd diverged from my inspiration/source ref in numerous ways. Which was fine. But one thing I wanted to preserve design wise, was the hermetically contained ground floor level.
I'm quite happy with how this is developing. Particularly as it's my first such build project since returning to the hobby. I think it'll make a decent addition to my Russia 1812 arsenal. It's great to get started on the scenery side of things. But I'll have to start working faster and more efficiently, given how much I want to build, e.g. a wargame-able reduction of the whole of Smolensk! I must be mad...