Here are 3 Unique Starship Designs based on my StarTrek universe of the late 25th Century. The Canada Class is the longest Crusier even with such design to the Alien ship Dauntless Class as seen in ST: VOYAGER. With a smooth saucer section like the Prometheus Class and more stealthy looking warp nacelles.
The Switzerland Class is more like the Wolverine and Zeus class ship designs but as a crusier this type of vessel can manoeuvre faster like any other vessels in space dock or through asteroids.
The Russia Class is more scientific type deep space exploration and with the right firepower could be able to withstand 4x Romulan Warbirds and a Vorcha Class attack crusier.