I figured plexiglass was more cost effective than getting glass shaped and cut its stronger than glass and I believe someone told me it is similar to bullet proof glass(but don't quote me on last part) and then you can order it in the color you want as well (www.professionalplastics.com they even have bronze for a fake jdm type look) I was also thinking the thicker the better for strength purposes but as for the flushness on inside that wont matter your upholstery shop should be able to fix that you just want outside to be flush and even.