The frame isn't going to be a big part of the weight, even a lighter older frame will only drop a couple lbs off at best, my old 90s c-dale came with a steel fork and wasn't all that light. But looking at your build there's nothing light about it. Nice looking and well equipped as far as being a commuter, doesn't look like there'd be anything on there that would fail or not serve its purpose well, but nothing that looks all that light to really build a lighter bike. From the amount of stem showing another size larger frame might not be a bad idea though that won't help in the weight department but it would get the stem a little further in the headtube and the seatpost still has plenty of length showing so you'd still have plenty of adjustability if you needed.