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				 Retrofit ship (base) design calculator 
 Fiddling  with best way to bulidind ring world made me do a spreadsheet covering planning a series of designs used in what I would call "retrofit ship (base) construction".
 Hope you will find a way throught it and find if usefull as well.
 
 
 
 [This message has been edited by alasyr (edited 22 February 2001).]
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