The more I think about it the more it makes sense to have a dedicated motor that travels with the bandsaw. If you want more power just mount a bigger motor from some junk vehicle. A driven carraige is probably needed to make use of more than 10 - 15 hp.
That electric motor should be plenty. Here is an example of an electric band saw head:
Sawunits
You'll need to have a way for the power cord to traverse. The Wood Mizer video shows a fancy cable carrier.