I've been toying with this project. I'm thinking of using a pair of IB12's or a single Lanzar Opti 12" in an infinite baffle configuration. I haven't found any good examples with pics for ideas yet.
Not quite sure yet. I really like my Lambda PB12-LE except its very heavy enclosure. I might just build a smaller/lighter enclosure and buy a BAT kit to get rid of my car's saggy a$$.