here something else.
a klingon fed hybrid, not like the one centurion is making for me
This one I'd really have to wonder about.. I can't see the K'Tinga neck being strong enough to support that Connie saucer. And why cut the K'Tinga's forward pod in half? I might be able to see the torpedo assembly being replaced with a Klingon assembly, but you'd have a lot of Klingon warriors rather honked off at the dismembering of a Klingon spaceframe like that to mount it onto something as decident and soft as a Federation Heavy Cruiser.
I'm sure that the K'Tingas really *did* only have one toilet just to make the warriors surlier.. and that one was probably vacuum operated at that.
(image: Klingon warrior crouches in airlock, takes off belt, and wraps it around support post. Hits "Flush" and bathroom waste and most of the airlock atmosphere gets flushed into space. Warrior manages to close hatch and start repressurization before he passes out from lack of air. Wakes up to other warriors banging on airlock door, and pulls up pants to leave airlock)
Pretty sure that KF would agree with me on this, but I can't see the design ever leaving a development yard for any extended period of time. From a reverse engineering point of view, some of it would make sense.. but the bridge module alone from a K'Tinga might (with a lot of work and adaption) fit inside the bridge module port for a Connie saucer.. but that'd just be the bridge, not the rest of the upper superstructure.
A better adaption would be Mackie's "USS K'Tinga"
Personal opinion though, and as always YMMV..