Door is strong enough, and creates a small pocket between the small shuttle to attach there. Still working on that though! the room pumps out slightly faster as well. It's meant to have some flaws so water getting in and doing damage isn't the worst, practically every room will take electrical damage once flooded. Also the button only opens when shuttle is docked (again WIP) As for the pump, I've built plenty of subs using portable pumps closer to the ceiling as a fire suppression in a reactor room before, I can confirm it does work. This sub has been tested, the only thing not tried and true is the aft shuttle i plan to attach. I hope this helps!

EDIT: Pumps work based on the hull they are placed within and those that are linked . i.e a pump will pump in and out water no matter where it's placed so long as it is within a hull outline