How Many Pieces? Texture Sheet Res?

[King Mango]

Hi everyone, I haven't done any game art since UT2004. Getting my head around all the awesome new tech and I have a question about asset proportions. In the posted image the yellow bar shows a scale of 128 unreal units. I'm going to model the scene more or less symmetrically but I want to be able to recreate a suggestion of the wear and tear so I'm almost done blocking it out this morning, and my question is, now that I'm ready to start detailing, how would you go about sectioning this building out in a UDK production environment?

Lower
There are a lot of repeating shapes but they are so close together that if I just made the bare minimum, texture tiling would be quite obvious. So taking a look at the "ribs" that encase the pedastal I'm planning on making 128, 64, and 32 uu versions of the straight sections with "square" inside and outside corner pieces. Looking at the image, the green strips and blue strips show the basic forms I am capturing, would you model strips of each row, or make that whole run east to west (in each stepped section) one piece between the orange? Would you make the protruding pieces only and leave the inner surface as a chunk of BSP?
Actually the more I type, the more questions I come up with... So how about I just leave it all up to feedback from here on out? lol