funny this post came up....
After spending last year with side sacs around the direct drive and the rear sac in place of the rear seat, i realized how hard it was on the inside of my boat to walk all over the vinyl.
My solution was to simply build a side panel and carpet it to cover the storage space in the side and place the side sacs in there (plumbed in with an overflow).
Next I simply made a box for the rear seat with a hinged lid and button straps to keep it shut and encourage the overflow...I am in the process of upholestering a nice cushion for it.
It works great, the overflows kick in without any stress on the box or panels...my only complaint is I lose a lot of my side weight.
Ill get pics when I get a chance....
www.midwestwakeboarder.com