Since the game is called Orbiter, why not make a new space shuttle. I know there ia a very poor version of this on the site, but how about a full size version with all the rtimming for the X-33 Verture Star. Attached are some drawings of the X-33. One has it launched for a drop from a 747. Since you did the X-15 and X-15 Delta, this is just like that. Then you could launch it with launch complex and go to the ISS. Rockwell, McDonnell-Douglas and Lockheed did proposals so you could have all three ships for each
Senerio 1. Practice Drop from a 747 over Edwards. No power, just a drop like they did the Enterprise in the1970's At 10,000 km, drop unpowered to the long runway at Edwards. All you would need is the release screen to detach and the "G" key for landing gear
Senerio 2. Launch from a special pad at Kennedy or even better Vandenburg AFB to meet with The ISS. It could enter orbit and on the first orbit launch a Telecomunications satelite. Then on orbit #2 dock with the ISS. Launch can be Manual with the"P" key to start countdown or start it automatically at T-5 minutes.
Senerio 2. Launch from a special pad at Kennedy or even better Vandenburg AFB to meet with The Space Shuttle Atlantis for a rescue mission. It could enter orbit and on orbit #2 dock with the Atlantis, rescue the crew and return to Edwards or Kennedy. Launch can be Manual with the"P" key to start countdown or start it automatically at T-5 minutes.
I have are some photos. E-mail me at firstname.lastname@example.org
if someone is interested in doing this project
Think about it