Federation Commander

The center strut needs to go one direction or the other, not both. Looks out of place with the flow of the rest of the design.

The last one on the right looks quite good, possibly with a reshaped "bulb" underneath as well. As for weight, you could always cheat and say that they used advanced, light-weight construction materials to build her.

Got those. I figure the cockpits would have to, at bare minimum, have enough height for a seated humanoid figure.

Are there any official size figures for the Federation F-14 and A-10? Length, width, etc...?