I like the chameleon barrel in general, I have one on my Purple build and it fits. Two me you already have two focal points - the orange frame and the awesome slide. The chameleon barrel in this case detracts those two points by adding a third which doesn't really tie in.
Thinking everything else should be subtle "accents" not focal points. A barrel matching the pins, slide stop, slide lock and maybe even the sites/trigger - if all stainless that might work. I kind of liked the work up with the stainless pins, ties the frame to the slide if you will.
Of course, like fashion, beauty is in the eye of the beholder so ultimately it is what you like.