I think there's a fine line between assembling a kit on one hand and on the other using the kit as a starting point for something more imaginative and, arguably, more detailed.
While much of the interior is out of view, and other choices might have been available in respect of modular display, that is, a removable roof or wall section, you clearly have applied a good deal of thought to presenting the building far in excess of the original offering.
Thinking about the modular concept, to completely remove a section of the roof or to have a cutaway of a wall to expose internal detail, would be a straightforward solution, here or with another project.
My view is always to look beyond what the manufacturer intended and see where it takes me.
Don't beat yourself up; this is an imaginative display.
