Printing at 8.5 x 11 isn't a full-size image so I can't compare them, but the shape is correct. I will say the "wings" are vestigal from my buckle being a lap belt in its earlier life, they can probably be eliminated resulting in a more streamlined design. BTW, the tongue is 3mm thick if you're going to have some made up.
Also, I'm not sure if the buckle can be acrylic; it may need to be metallic if the receptacle is anything more than a simple mechanical catch-activated switch. (I.e., if it's magnetic or passes any kind of current through the buckle.) My guess is that a non-metalic buckle will work but I really don't know.
