Here is my answer to everybody's request over a TrekBBS for a Luna/Titan Variant.
Meet the U.S.S.Apollo. She is a Lunar class cruiser, a close cousin to the Luna. Here warp nacelles are above instead of below the saucer. She has a dedicated weapons platform where the Luna has the sensor pod. It is removable. I have also swapped out the impulse deck with a new one, also note the third impulse engine, this ship does separate in to multi-vector mode. See the I.S.S Titan for what that may look like.
This is a Refit version with Slipstream ability.