They are 3 great images Peter! The last is exceptional, I spent so long trying get all that in 17mm, the use of the fisheye there was a perfect choice, that also has to be the closest to symmetry as your gonna get from that bridge position!
The more I look at #3 the more I like it, the composition of the image reminds me of a insect (bear with me here!) the plyons are the body and the cables the wings - that image would look awesome as a desktop background!
Whilst the second image may look simple and plain enough, to look at that building and compose those lines is quite an achievement in my opinion, I just walked by that one

was there any distortion correct on this one?
In terms of BW conversions, I think they all work well, however I would be interested in seeing that third one as a colour version, in particular with a nice blue sky...?!