Regarding the Hawk, my suggestion is to follow the Catacombs site:
http://www.space1999.net/catacombs/main/models/w2mhawk.html
The basic specs mentioned are:
- comand module with 2 person crew detachable
- middle section with fuel
- rear section with engine detachable
- twice as fast as the Eagles
- The spherical main engine » "gas core" nuclear rocket - very high exhaust velocity (20km/s+)
- black square panels in front of the main engine may be deployable fold-out radiators rather than solar panels.
- side boosters point outwards, allowing fast lateral movement.
- Eight vertical boosters on the underside of the ship
- no rockets on the top or side
- small attitude control rockets laterally
- main armament seems to be the cylinders at the end of the stubby wings, they flash like machine guns
- The rectangles hanging under the wings suggest missile launchers
- The dots along the front ends of the wing and rectangles may be conventional lasers.
The Eagle VC is a good option. Adding some nice RCS jets at the right places would also make the model come alive.