glad to see this taking shape.
How did the wooden planked edging of the tower deck go? I think thats an area I can tighten up on the tolerances to get a better fit.
I like what you've donw with the beam work on the ends to get a fully 3D effect. Clearly this is a problem if you want to join the watchtower together with walls but as a stand alone piece looks good. If you'd let me know i could have sent you styrene pieces for this though :p
I like that cat litter effect you have going on there too