The terminals can be anywhere...
you can either use a cup or simply a hole for the wires to come through (don't forget to use silicone).
I can see that you've got a bit of space toward the right side of the box. (aft of the car) You could place your terminal cup there. Terminal cups are already sunken in, so it won't protrude, only the terminals themselves.
Sony C90, 210 EQ
Seas 27TDF/C, RE XXX 6.5, custom xo (dyn 240GT sitting idle)
RF 60.2 amp
Soundstream picasso 1400.1D
Bass drive-by's are uncool.