Hey, I'm not Waz but I'd like to pitch in too.
- I think the Lollistons would hardly be in a position to try anything funny since they would have answered the muster at Riverrun, and the Lannisters are present in such large numbers they couldn't even have done something sufficiently annoying had they not. Tywin intentionally ventures beyond the Trident because he still expects the Vale to join forces with Robb, and by setting up at the road leading into the Vale he is able to hold a position where he prevents the armies from joining together into a larger force than his own. I doubt he would venture too far north along the Green Folk to subdue the remaining women and children in an area he cannot expect to hold, but if he did he would likely torch the entire area rather than a few select places in a scorched earth tactics kind of strategy.
- The road to the castle seems to be a standard 3 blocks wide road which is used for most not extensively used roads of the area. It looks small next to the rediculously wide Kingsroad though, but it's wide enough for two cards to pass eachother opposed to the 7 blocks wide Kingsroad that can comfortably accommodate two trucks driving abreast in both directions. If anything other roads are too wide, especially considering the canon in regards of the state of the Kingsroad in the area. I haven't checked ingame though so I'm entirely relying on the dynmap here.
- I agree with the bridge, which could just as easily be much lower/level with the terrain, or be made out of wood.