(ditto to what Issac said)
My bass player home-made his own 6x10 cab...we called it "the fridge" because it resembled one highly in its big, ugly, boxy looks.
Anyways, he only had money for 4 speakers, so he slapped in 2 extra 10" car subs to fill the 2 empty holes...and it sounded like dirt. He ended up patching over the other 2 holes and dealing with the sound of an extra-large cab, then bought the other 2 drivers about a week later (somehow he came up with the money).
So yeah...his sounded like junk (we play melodic/death metal, tuned down to C), but you might like it. Give it a shot, it might sound good - I've never heard a bass played through a model T anyways except for Sunn the band...and they're not bass, they're subsonic :-p