So I’ve recently got myself a beauty of a 1989 Chevy G20, bare metal inside..through various sellers online I’ve got myself upholstered door panels, doghouse cover, dash pad, etc. My question is what’s the best way to install these? There’s no cutouts for switches or the speaker, just one piece, and the door panels go right to the bottom, not just that little quarter panel. Do I drill new holes with fasteners? Glue? Any advice would be greatly appreciated, thanks y’all