mdf center console and fiberglass sub box

i made  another box for my 12" sony  ...i made  with mdf 3/4" dont want to ocupate to much space ...so i used the side of the  cargo area and  cover it w/ some vinil that i found in  walmart....what do you thing ...is in the same  page.....

i used the relay to turn on 2 amps(one for the speakers and one for the subwoofer) and the neon light when i turn on the head unit....just connect  the remote to the 86...ground  the 85 ....add 12 v.fused to 30 and split the 87 in three (one for each component).......cover the 87a  to avoid any  short...and add a diode between 85 and 86 to avoid  feedback..or that pop that some times you hear when turn off the head unit...that's it.....i did  it because i think the remote wire from the head unit is not strong enough to turn on three components....i heard is only 200 ma or 500 ma only.....and dont want to mess my head unit

im peruvian.....but im livin here for almost 4 years.....and i try to learn all that i can about this staff....and the only way is getting the hands on ......now im gonna remake the center console ...first i'll do with cardboard to make the model ..and later in mdf and fiberglass....now one question....i got various leftover headunit kits from diferents cars the question is ..the fiberglass will stick to the abs plastic that those kits are made.....or i have to do it with another material?