According to the Noda beYahuda, the 100 “rabbanim” need to be Lomdim Miflagim and at least be able to Pasken” – and know the Halachas relevant to what they are co-signing- not just any guy from Kolel. Also, the original three initiating the Heter need to be Rabanim and Poskim Muvhakim that know the ins and outs of the situation. They need to acknowledge that the Heter is legit.
See below link for more:
http://www.hebrewbooks.org/pdfpager.aspx?req=14661&st=&pgnum=160
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