Hey, welcome to the forum! We had a thread about this last year ... somebody found a place that makes replacements and also custom storage bins. I was thinking of getting one, and now I've lost it. Somebody?
Thank you both for your recommendations. I think a custom door is a great option that will look nice and give me good access to the area behind the seat.
I put a plastic bin inside the area behind the new panel, which was after I took the pictures (so it's hard to tell how much space there is, but you can see the ice maker in there for relative size). I had a space back there that basically fit a container the size of a clothes basket. I keep my tools and cleaning supplies in there. Here are a couple pics of the finished product:
Answers
Keep checking back. We'll find it.
https://www.boatoutfitters.com/build-your-own-custom-starboard-boat-door
https://rinkerboats.vanillacommunities.com/discussion/8714/door-hatch-panel-color#latest
Dream 'Inn III -- 2008 400 Express
Dream 'Inn III -- 2008 400 Express