DeAgo star wars upgrade,this is my interpretation of what the Ion engine grill should look like. the fins are curved so when you look at it from the side, it looks slightly rounded and finished instead of just a flat panel.I have made it to fit along with defuser panel that came with your model. see through engine grill panel with detailed cutouts for light to shine through. This part is available in Strong & Flexible White plastic. Thank you for looking and good luck with your build.
if you have any questions please don't hesitate to contact me.