Humm, I don't think you can just cut a zipper. Replace a zipper maybe. Ive done it and is is a lot more work than what I'm proposing. Also, let me reiterate that I want the full structure at the end of the legs, and we are talking about taking a (possibly) over-sized pant to start with. So we may be talking about a lot more than an inch of two off the ends. I also might want the articulated knee to actually line up with my knee, and so on.
We are also talking about a very expensive item where I want to custom size them so the final result is like a perfect version of the original sized for me. I *can* see how the method you describe might work great for lots of people, it is just not what I'm interested in in this case. I have hemmed pants at the end a ton of times (I have to or buy kids pants , lol), but that doesn't work for this item.
Lets assume for the moment that I really was serious about wanting to know the answer to the question I asked. Is there a good way the reseal the seams on this material. Guess I could call Marmot. Anyone tried to do something similar?
Full Disclosure, in addition to knowing how to hem the ends of pants, I have done many a hack job (in desperation) on nylon hiking pants over the years by cutting off the ends and using a lighter to seal the threads. I feel I have genuine hack-job street-cred... I'm just trying to rise above my station on this one!
I think I will probably risk just buying them, and if silicone sealer doesn't bind I can just peal it off and try something else.