I have the Givi set up on my SV. I know it's not exactly the same as what you are asking, but a gentleman at work has the Givi rack on his DL650. In terms of configuration, they look just about identical. The only difference I note is the mounting on the passenger pegs as I think the SV and DL have different passenger pegs.
In any case, the Givi rack itself increases the overall width by no more than a few inches. The bars have maybe a 1" gap to the plastic on the rear sub-frame and the bars themselves are around 1/2" I think.
I think I may have the E40 cases. They are basically black suitcases on the "monokey" system. When mounted, they are fairly wide (eliminates lane filtering). However, they fit a lot of stuff. Until I dragged one of the cases getting excited in a turn, and dropped the bike (while camping) on the same side, the case was fully waterproof. The other one (after 43K kms) is still a reliable tight seal.
I really like the Givi Monokey system and the saddle bags. For road trips, they are just awesome.