I used an oil/water seperator for an air compressor. It is not cool looking at all, but it is cheap ($5.00 at home depot) and most importantly, it works.
I did the same thing a few years back. As far as the seats, they will bolt right in. The seat mounts are the same for bench and buckets. From what I remember with the console, one of the brackets is there. The other I made up a spacer and used a self tapping screw. Hope this helps.