Mattel LED Football Battery Cover

gsargent's original piece said that it would work with any of the 1970s Mattel handheld games but I found that the dimensions were quite different from my 1977 Mattel LED Football game. This is my first attempt at editing a 3D object so it's not quite perfect yet. As soon as I've honed my skills a bit more, I'll update this with a more exact fit.