I've found nothing definitive on the body-size issue. You could ask Customer Service, or maybe do a poll of the BT fans here & collect measurement & serial number data -- me, I'm too lazy.
A little shopping before chores...
At GuitarCenter.com, three Mavs & a Billy, NONE tagged as BT -- shop wisely, y'all -- in the $85-$100 range.
For you hardcores, the fourth is what I can only guess to be a one-knob BT-5
Same model, different site --
Over at MusicGoRound.com, a turquoise flake BT-5, $150 + $50. They're also flogging a blue BT-2 at a goofy $130+$50, & are clueless enough to trumpet this as a "Price Reduction."
A few Mavs at Reverb. Another turquoise, $200 + $25 OBO. The BT-3 was only offered 1997-1998, & the contagious CSB just '98, so I'm inclined to forgive the seller for asking $175 (OBO) + $55. Is he correct about the "maple body" bit, or just talking about the top? And is that a veneer or film?
Though $120+$36 is a little high for a BT-2, another seller's probably tiring of it hanging around so make an offer -- especially if that case is part of the deal. He can be forgiven for saying the guitar's 2005 or newer.
Over on eBay, not much but a decent-looking BT-2Q in need of TLC, & some "wtf?" tuners too, $100 delivered.
Per an older discussion, the Cherry Sunburst slapped onto so many BT-2 can vary wildly. I could probably start a gallery of the whole eye-killing spectrum, but here's two that'll give an idea.