I discovered this photograph of one of the ssgn conversions with what appears to be a new type of dry dock shelter on it.It certainly seems more hydronamic from the front but look at that big hinge for the access door!
http://bp1.blogger.com/_AxAS8qkXvUU/RtJodu1_SCI/AAAAAAAAAOU/gNcwp2CGoXU/s1600-h/SSGN_1PCAN.jpg
http://bp1.blogger.com/_AxAS8qkXvUU/RtJodu1_SCI/AAAAAAAAAOU/gNcwp2CGoXU/s1600-h/SSGN_1PCAN.jpg