Help building a part for my drag car

although NHRA never bothered me about having rear speakers.
I PUT .063 SHEET ALUM. OVER MY ORIGINAL REAR PANEL IN MY 68 FASTBACK, after I reworked the it. I don`t run a back seat , it would be useless dead weight w/ a roll bar and rear struts anyway! I finished the whole back interior to look like a factory business coupe. LITEWEIGHT AND LOOKS PRETTY DARN NICE.