Hi,   
   I would like to build a periscope with very large openings (300 x 300 mm), but   
   a very narrow middle section (diameter of 30 mm). Would it be feasible as a   
   personal project, without access to a lab, and with limited budget?   
      
   Please see my schematic here: http://imgur.com/AWpvz4n   
   Does something like this would work?   
      
   Any tips would be greatly appreciated. Thank you!   
   Greg   
      
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