You could probably have a starboard door fabricated. I am guessing it would need to swing up. It could come to the edge of the steps but that area would still be open. I must admit I have never seen that done. Mine is also for storage. I keep folding chairs, fish bag, cushions, long boom downriggers, and two hassocks of life vests. Everything is packed to keep from jumping around in choppy seas. The hassocks help buffer the downriggers which are held together with bungees.