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I'll chime in..before I cut up the back fender on my Blackline (same rear fender as the Slim) I was scouring this forum for pics and didn't come up with much info so hopefully this will help you out.
I cut approx 3-1/2"-4" off the back of my fender, kept the same radius on the corners (as best I could)
Measure and make a straight cut across the fender and then transfer the radius with the cut off piece. Remember the more you cut off the fender the bigger the gap between the fender and tire will look. Hand held grinder did the trick.
When I was happy with the length I mounted the fender and stood back to take a look. The fender to tire gap was way too big (and I'm lowered) so I pushed the fender down in the struts so it would hug the tire a little tighter..marked my new mounting locations and drilled new holes. (approx 1-1/2" higher in back mounts and 1" higher closest to the seat than the original mounting holes)
Once I had the fender lined up at the height I wanted and everything bolted back together again (make sure your seat still fits properly if you lower the fender in your struts) I dropped it off for paint. Painter had to weld up the original mounting holes as the struts didn't cover them.
My bike is lowered (as low as it will go with the lowering bolts) but I've never once bottomed out the tire on the fender, plenty of room to spare under there (even with a passenger)
Hope that helps..
I was planning on a Swing arm mounted "Hugger" rear fender when I found a Craigslist Slim fender cheap in my own town. I cut off 6" with a cutoff wheel, then smoothed the edge with a hand grinder powering a green "scotch bright" angle grinder with a sanding DISC.
Touched up the bare metal edge with black paint and the stock Harley paint looks great. I covered the fender with blue tape to protect the paint while working.
I made a template out of cereal box cardboard, folded in half so each side is the same, I cut close to the mark and sanded/ground (with hand angle grinder) down to my mark.
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