To me a simple tanker conversion of the shuttle A would lead to perhaps a crew transport version(extending hab/pilothouse block so as to make a shuttle B(for Bus). The only problem is that there is no one to make these ideas (virtual)reality; or was, if I can convince my brother to make the model. If I can do that then maybe a coder will magically appear and offer their services, I hope!
BTW, could anyone tell me if blender can be used to make models for Orbiter?