Possibly to keep stuff from rolling out when you hammer the throttle? Not sure.
As for the scuppers - they are automatic drains. The pressure on the outside flapper should keep them closed, and prevent any large amount of water from flowing back in the boat.
The board doesn't look very functional, however it is possible he put it there to keep stuff from sliding off. Will be a few more weeks before I find out if the motor has enough power to make that happen
It's to keep stuff you want in, in; and to keep stuff you want out, out.
with a set-up like that you can ship a lot of water over the transom and into the boat. You will want to keep that board in place for both safety and convenience (staying dry).
Yea that is to keep some water from coming in and stuff from falling out. I have the same boat and I want to make a board like that or seal it comepletly. I don't know why its made this way. I guess if a large amount of water comes over it will drain out quickly. I have a lot of weight on the back of mine(kicker 9.9) so I always have water coming in.