This topic isn't restricted to Trek designs, but I recently acquired some new information on warships in the Battletech universe, and I've always found their Yardship concepts interesting. Basically, the Yardship is a specialized hull built around a forward dock and is able to function as a mobile support/repair unit for other capital ships. Only two such designs, the Newgrange and the later Faslane exist. Jackill's Kentwood class bulk transports are sort of a Trek analogue, albeit only designed to transport other ships to specific places. I suppose one could argue the Defiant was considered highly specialized when it was originally developed to fight the Borg, though one could also say it's not too different in principle from other warhorses in sources like FASA and Jackill's manuals. Does anyone else have specific designs they like, and opinions on how "specialized" a design might theoretically be (depending on what its purpose is)?