After building the Tower Bridge, I felt like doing something similar to that style. So I was going to build a section of the Westminster Palace. But I underestimated the amount of bricks it takes to just do a 2x3 building. So I cut it down a bit. Still in that style, but simplified a little.
The Westminster Palace looks like a big cardboard box from a far. So it gives me this idea of building my building in panels. So it's easier to carry around. All 4 sides come off.
4 sides sit on the base and then are locked together with technic pins (forgot to take pic of the pins).
The side towers and the roof then sets on top of it. The roof is built with a technic frame.
This first thing I thought when I saw it was that it reminded me of the Tower Bridge style, so you definitely captured that. I can't imagine what your original plan was if this is scaled down, because this is fantastic! Really great design work, nicely done