I also wonder if it would be possible to cut a "Window" on each side of the slide completely through, near the muzzle, on the angled side surface to remove a bit of weight?
It's sort of funny you'd ask such a question, because:
Brother in law snapped this one and I didn't know it. Excuse the horrible quality. I'll get better pics once it's back from being coated. The thickness of the slide there makes the lightening window look really, really good because of the depth it adds when looking from the side.
I'll PM you in regards to your question. I don't want to violate any rules here without being a forum sponsor....yet.