Is it possible to take a bass cabinet and turn it into a guitar cabinet? and if so what would this require?

Just use it like a regular guitar cab, unless it's got like 18" speakers or bigger.
^ Yeah..

The only difference is the speaker size, really. I would suggest 12's or 10's for a gutar, but if it has a 15' in there already it might be ok.

Plug it in, see how it sounds.
Enjoi <--- Friend me
Quote by Scowmoo
Otter, you're my new god.