as a matter of fact sir, i did measure the max dimensions of my box and the size of my trunk opening, i was off by maybe 1 inch if that, its almost impossible to factor in the trnk opening and the internal dimensions... its not that much of a loss anyways, i have a few potential buyers for the box and it only toke me about 3 hours max to build it...
yeah, ill probably do that next time, i just finished another box that fits in fine, its 30in x 17in x 15.5 and has about 3.1 cu ft internal volume after both of my subs and pcv ports, each sub needs about 1.5 so hopefully it sounds good, just waiting on my 2nd sub to come in sometime next week