Bilge drain
Flip the door closed, keeps water on the outside of the hull----- A good thing
Get up to speed and flip the door open and any water inside the hull is drained out via suction created by rearward facing scupper on the outside of the hull:
Depending on what state you're in, it may need to remain 'officiallly' a Starcraft. If you don't put an Alumacraft logo on the hull, don't discuss it w/ potential buyers AND believe the guy you bought it from really did have legal right to sell the boat, then I wouldn't try to change the paperwork if you're in a state that's difficult to make changes. Here in WV I'd probably just have to call Bob at the state DMV office at the capital and send him pix of the boat and any brochure pages that indicate the title is wrong, and he'd make the change w/ little problems, but he'd likely contact the seller I got it from too.
IMO, it'd be worth a call to whoever sold it to you to make sure he doesn't still have a Starcraft boat sitting around w/ Alumacraft paperwork still on his desk, on the off chance he gave you the wrong paperwork.....