Looks pretty nasty inside. I'm guessing the orange/yellow coating all over the inside (some sort of fluid leaked out all over the place?).
Is the big thing in the middle the capacitor in question, or is that the transformer?
I found a laptop power supply listed at best buy that is 19V, 100W for something like $30. Might be an easier way to go, I'm thinking? If the output is controlled enough to not fry a computer, I imagine it would be ok for enlarging too?