I have a 2001, and I have thought many times about doing the hard ballast setup, but there are a lot of times where I need that space.
Think about this- Where do you put the cooler? Behind the hard tank? Now it just eliminated a persons seat with no leg room.
To each his own, but no matter what I always end up with 6 people on the boat and with how small the 2001's are, I need all that space.
I am planning on a permanent hookup for the sacs for mine. The will each have a 3 foot hose comng off the sac and will plug into some permanently mounted plugs on the engine compartment. Now I can take them out when needed, and always have the pumps mounted in the bilge.