Yep jass, the chain guards on our bikes are not the best lookin' things bolted onto 'em, and they especially look too short, as you said, after some of us have removed those original ugly-azz passenger foot peg holders that were designed to mimic the old tool boxes on 1930 era Triumphs.
And so, what I did years ago after removing said ugly-azz "'30's tool box inspired"(okay, so maybe the word "insprired" there was a wrong choice of words) passenger peg holders, was to rivet about 3 or 4 inches of right-angled stainless steel sheet metal to the front of the chain guard going forward, so that it extends to behind where the sidecover sits, and thus makes it look a little less like it's just stuck on there willy-nilly, and to give it the look like it's flowing from under that area and back to the rear sprocket!
And then I re-painted it all black, as I have never liked chromed chainguards on ANY motorcycle, because...why would anyone want to draw attention to a part of any motorcycle that first, isn't usually a "pretty part" of any motorcycle, and secondly, especally our model's chain guards, which are among the ugliest out there anyway!
Yep, it's kind'a like how I could never wrap my little noggin around the idea on why ANYBODY would purposely add that chromed cover on that ugly-azz and ill-positioned rear brake reservoir that's sittin' out there in plain sight on the front of our bikes TOO!!!
(no offense to those folks who have those things on their bikes around here, of course)
