If I were you, which I am obviously not so take these comments for what they are worth ..
This image:
I would try to lay the stones to avoid short edges lining up.
If the stones overlap there is less risk of the stones shifting, in real life ...
Another thing. I would have enclosed that circular lid with a ring of slightly cut stones, straight edges on the outside, cuts to make a "smooth" circle on the inside. Maybe 6, 7 or eight stones to go around. The stones butting up against this would be cut at angles to fit. Avoid small bits by cutting a little from two larger stones (instead of one whole and one tenth of a stone use two stones cut to 5 tenths and 6 tenths respectively). This is important for stones laid in sand, if they are mortared down then it is more of a cosmetic thing even if there is a small difference in strength.
Brick walls: Check real brick walls. In most cases (bonds) the bricks are laid so that some stones have a short edge showing on the face of the wall. This provides bonds through the wall so that it becomes one wall instead of vertical slivers standing close to each other loosely held together with mortar.
How these things are done varies between countries so my comments are based on my local experience (bricks in walls must be done with cross bonds, otherwise the structure will fail, low garden walls might be simplified).
Corners: If a half brick or whatever is needed to make up the correct distance the small piece does not go on the corner. Lay a whole brick on the corner and put the small piece a brick or two away from the actual corner.
This image:
Is that balustrade standing on the floor? Looks like a dark gap under the lower beam ...
Boulangerie: Where are the loaves of tasty fresh bread?
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Has the baker stopped baking and started brewing moonshine instead
Outstanding work! I am impressed!
/ Robin