Yep my 95 Accord is exactly like yours and it was a bitch trying to put in a box that is 17 inches tall. I had to install the top piece in the trunk. Its all worth it now tho.
i would fire toward the cabin with such a big box. From the looks of it, all the air movement is going to be stuck in he trunk and just cause a bunch of awful rattles.
own 2 fords, owned an 83 rx7, and will probably get caught with insurance fraud...plus i love my honda 42mpg, heat, ac, 95k, no problems with it...awesome car imo