My bad... I guess I wasn't clear...
In the pic above, the larger ship is an N-BB... a Neo-Tholian Battleship in SFU. The little guy next to him is the Tk5- an F5 with a Tholian PC gradted on the nose (Since the F5's boom got away).
A shame the Tholians aren't in-game, otherwise flying around in the TK5 would be awesome.
As for the other 'requests'- well, someone had an idea of what Tholian-klingon derivatives would look like.
Erhm... in SFB, the entire front end of the klingon ship can disengadge. So can the 'diamond' part of the NBB above. So, switch the boom with the command module (Diamond) and you have some new ships.
I wondered what a PC grafted on a SFC/KA f5 would look like, but I don't have the modling skills to pull this off.