After careful planning these are my basic building blocks appended into one scene.
And my object list also changed a bit.
Modular structure meshes:
-Wall L [3 x 3 x 0.5]
-Wall with window H [3 x 3 x 0.5]
-Wall with door H [3 x 3 x 0.5]
-Simple column L [3 x 0.5 x 0.5]
-Double column H [3 x 1 x 0.5]
-Corner column H [3 x 1 x 1]
-Big column H [3 x 1 x 1]
-Floor tiles L [0.25 x 1 x 1]
-Ceiling H
Non-modular ornament meshes:
-Carpet L
-Benches / sofas H
-Candle holders H
-Torch holders H
-Tomb M
-Altar kind of thing H
-Chest M
-Flags / shields / swords on the walls H
EDIT
I added some more base parts.
