I am repainting my Blueback, and I was wondering about the exhaust openings--at the rear of the casing, rectangular, two to port and one starboard. At Tim's site there is a photo of Blueback before refurbishing, and the port openings are visible as two large vertical rectangular holes in the casing, but in the refurbished Blueback on display the openings have been covered with sheetmetal. What did the openings look like on the operational boat? What would you see if you looked into these openings? A chute with the exhaust opening at the top, maybe? How deep were they? Were they covered with a flap? Does anybody have photos or drawings, or can you make a sketch? If they were as open and as large as they appear on the photo of the delapidated Blueback, then I'd like to represent them on my model. Thanks for your advice.