Soo I'm building the Andrew dft odst but I'm gonna change it up and make it my own but I can't find something to use for the viser that's see threw reflective and I can still cut to the proper size of the template
You have a few options here, first and foremost are you familiar with vacuum forming? Second if you have a motorcycle shop by you they usually sell see threw reflective visor's you might be able to work with. Third, and yes I'm going to do a bit of name dropping here, but Sean Bradley is a very skilled member here on these forums and craftsman, and specializes in ODST kits not sure if he is still selling his visors as singles but you could shoot him a message and see if he is still making them, they are of great quality, unless you want this 100% made by your hands then revert back to the first 2 options I gave you.
With the proper tools, you could get a thicker type of plastic glass (plexi-glass type), and put a reflective see-through mirror file on it. I ordered from MDP Supplies: Privacy / One Way Mirror Film.
Otherwise I'd just do as earlier stated, get a motorcycle visor and cut the right shape from that.