What you could do is take both V-maxes and run an isobaric enclosure, or sell one V-Max and keep the other, either would be better than the Bazooka. Cheaper and better.
please please please dont do the bazooka and yes id just remake a box for the vmaxes. Also see if you can custom install them other than in just a box and save yourself some room. I dont no what the civics are laid out like but maybe you can squeeze them in a back deck or in a fiberglass setting along the sides of the trunk. I dunno just food for thought.