First off, the workshop manual is FREE. There is a link in the 1300 section.
Stop looking, I found it.
http://dl.dropbox.com/u/43841212/Honda%20st1300%20workshop%20manual%2003.pdfThis might work better.
http://ozstoc.com/index.php?topic=407.0There shouldn't be any hassles with 65/55 headlights. Refer to numerous posts about headlights and HID conversions.
Number 2.
With MCL or Helibar risers, the centre comes with the risers. Although MCL do have a plate that goes between the bars with a ball mount.
http://www.motorcyclelarry.com/index.php?main_page=index&cPath=3&zenid=n5kknd9bsd54r7epms1rb53003I have raisers on mine and there is a bit of flex, it is not excessive by any means.
Number 4.
MCL have fuse boxes, ask Gavo about his. I used a 6 fuse box from Jaycar, which I put into the duck tail, on top of my radio. Then made a lead straight from the battery to the fuse box. This powers my lighting, horn and power sockets, with two spares for the future.
The choice is yours. Everyone will have different ideas. Not good, not bad, just different.