I thought about this as well last year but concluded for me I need the storage room under there with 3 kiddos and the wife we have alot of stuff when we hit the lake. Also have peeps for ballast and when we surf i throw the stock 370lb bag in the walk-through.

You could take measurements and get a custom bag built for the bow as there isn't a whole lot of room up there. But maybe the standard IBS http://www.wakemakers.com/fly-high-i...d-bow-sac.html will fit ok? I think the seats would definitely raise up though if you can jam that in there?

I like the "idea" of hidden ballast but in the outback it's pretty hard to do.
I'd be interested to see any response from somebody that has done it?