While waiting for my subs, I thought I should build a periscope. Let me explain... I plan to use my subs on a small lake where I have my country place. A lot of the time, the water is choppy and seeing under the air/water barrier is dificult. So why not attach a periscope to my dock? This way I can sit comfortably in front of the top end and have a clear view of the action below the water line. What do you think? Usefull? Worth the trouble? any recomendations on how I should build it? Any plans, links?