Frigate
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(Old) Light Cruiser
New Light Cruiser Assawari. The artist seems to have been influenced by the Constellation-class cruisers in the design of the rim.
New Light Cruiser Prince of Wales. That appears to be the shuttlebay at the stern of the hull between the nacelle struts with the impulse engines mounted above.
New Light Cruiser compared to a fleet Tug. The Light Cruiser is a modified Destroyer primary saucer with two smaller, more efficient warp engines.
Although this game is based on the starship, it is less than fully informative of the dimentions. Here are my guesses.