like the sovereign class one
http://www.kitsune.addr.com/SF-Conversions/Rifts-Trek-Ships/Federation_USS_Beowulf_Dreadnought.htm or the constitution dreadnought and the refit dreadnoughts(the original constitution class dreadnought was shown in another post so here is the refit one).
http://www.kitsune.addr.com/SF-Conversions/Rifts-Trek-Ships/Federation_USS_Federation_Dreadnought.htm It would be awesome to see tier 5 versions of these ships in-game.