Warp tool is a bit of a pain to use, though not impossible. Easy for a very simple warp, but gets difficult quickly. I will play with it a bit and also have a hunt around for some other options. I love Illustrator brushes for things like this but its hard to get a convincing wood texture that is simple enough to use as a brush.

I'm game to try curving the balcony. I think I'd better have another careful look at the map and get a better sense of what's where. Onward!

cheers,
Meshon