Planning, and Planning.
Into every cosplay I have made there comes elements of fudging, where you make things work. And you know it isn't perfect, and deep deep down it crushes your soul. I am trying to super plan this cosplay so I won't have as many of those. So I mocked up the forearm controls. I went to staples and printed it out, because I don't own a printer. And cut it out, and placed it on the statues arm. And I think it looks pretty good. I think it needs a little bit of rounding in the corners. But I nailed the buttons.