Hmmm - measurement sounds reasonably close to wheelbase dimension, unless someone has one to measure maybe wheelbase would do?
M&S in Newcastle have a 1000DS in the shop as I was looking at it this week, very nice too - take your tape measure if the frame is the same??
Headstock damage - hard to tell - might be as well to photograph it and contact Ducati UK, judging by the amount of frame replacements mention here on the board, they seem to know their stuff.
Roy thursby in Stockton does wheel repairs for around £50:
http://www.thersbygroup.freeserve.co.uk/index.html Good luck - Frank