i want to make a box wall type reflector in my trunk "around and behind" my sub box, to act as a hatchback.

as you know the hatchback pretty much kicks every other cars booty for response etc. the cars a7th gen corolla.

is this even achievable or just to hard to get a thought around or should i pay to try this idea?. i have 1200 peak watts-600 rms and i still cant get the response i had with the hatchbacks 280 rms. my bass is going to high... ts hitting the windshiled top. i wanna focus it like the hatchback did. no adjusting anything box angling helped.