i think in a vert it woud need to be glassed with some contour to it. like maybe 2 amps at the bottom centered in the butt area with 2 subs mounted across the back area. and then contoured to follow the shape of the side panels. be alot of work but look way better than the typical 2 piece flat mdf/plywood set up.
then either paint body color or upholster to match seats.