Thanks very much "snowwolflair " for the data on the Surcouf. I will get them blown up and with the photos will endevoure to construct the vessel. Are there any tips you could impart. To give you some of my background, I am an engineer by trade having worked on submarine construction for 17 years. I am currently refurbishing a 1962 O boat, namely "ONYX" which is berthed at BAE in Barrow in Furness. So you can see I am conversant with submarines. Thanks again.