It does look nice!
I would suggest looking at the middle beam, see how there are dark seams on the edges? It is most likely the base or dirt (even both!) showing too much detail - meaning that you must have uv mapped too close to the top or bottom.
Maybe look at the floor, pick a dirt texture that has:
and uv texture it on! That way, the floor will look much better with spread-out dirt. To keep in mind, I would select the floor and ramp (the part which inclines a bit) polygons, that way it will blend better.
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Yes, I probably would remove that wall to keep it separate...