I am using a cherrywood casket as the enclosure, the car is a 72 miller Meteor Hearse/Ambulance. So trying to make the install look nice without requiring boxes mounted inside the casket, that and since I no longer have access to a large space for a work area was trying to limit the amount of woodwork required. Also appreciated that alot of IB installs said that the sound quality was fantastic. The exact dimensions would be 78"x24"x12.25"(using a 3/4" mdf sheet for the top, So a total of 375.788152L, slightly over the Vas for two of them) I would lose a small bit more space from adding a mounting ledge and a couple horizontal braces to help support the mdf sheet. I guess it wouldnt be too bad to find something to support a 2x2x2 ported box but power requirements were my other concern, liked that I could run 2 15" off of a single 900watt amp. If you have any suggestions for alternate speakers I would like to hear them. I prefer clean crisp lows to boomy, and listen to a wide variety of music.