That is wicked cool! The TW-200 has always been one of my favorite bikes from a standpoint of looks - I just love the fat tires! If I ever get a little D/S, the TW is at the top of my wish list (the Suzuki DR200SE and Kawasaki Super Sherpa are there, too.)
A 250cc adventure bike? Nice. I have always liked the idea of 'doing more with less.' In the 3rd world you rarely see a motorcycle bigger than 200cc, there's no reason you couldn't do some pretty amazing travel on a 250cc bike and with that small engine, MPG (and range) would be awesome.