Yeah, of course I know them.
Designs of all my non-canon BSG ships were strongly affected by JustinDixon's Serius, backstept's Sygnus defender, Hobbes' Vanguard support ship, AldrikG's Agamemnon and so on. For example, the first design for my Skinfaxi was a hybrid of Valkyrie and Hobbes' Vanguard.
I like Sygnus very much, because her design has not only author's originality, but also important design keys to show she is just a ship that belongs to the BSG universe. In other words, Sygnus is unique, and I will never be surprized even if I find her in the show
The latter point is very important for me to design something for a certain universe. What I need now is not a design only. A technological (and histrical if possible) background story to support inevitability of its design against a certain universe is also needed.