I hate platform TDM's. They always seem to be occupied by a different group of people then the people who join other servers, they're usually stuff and unoriginal, and the gameplay mechanic is just terrible. I don't support people posting their platform's in Gallery because it's not like I haven't seen the exact same concept with a few different colors one million times before.
However
The sniper and grapple was a unique idea, although it does seem a bit out of place on this kind of build. I would much rather see it on some sort of hard to navigate rooftop build with connecting overhead pipes and cover and stuff of the sort, so that the grapple would have more use and you could have better vantage points and positions, and the mechanics would be overall better.
Anywho, nice build.