seems to me that this site could provide a place to start a data base of wind turbine tower designs that people have constructed and used.each tower would have its own data sheet of construction basics and the turbine diameter.there would be a section to note failures as well as success's ,general observations.some sort of method to authenticate the information as reliable established.it could have category's such as guyed,unguyed,each with brackets of turbine sizes.some designs could have specific design numbers,kinda like air foils have .persons in less restrictive areas could lead the way with tower designs and when enough data on a specific design was proved,persons in more restrictive areas could copy the designs.it could be thought as open source tower design or builders standard.