[Brett66]

Here's a picture of one of the proposed Orbital Space Plane concepts:

[chimera]

OK, so that looks like the old DynaSoar vehicle attached to the tip of some kind of Saturn-class booster. Basically the flying bathtub concept (lifting body). The reusability of the different parts would have to be determined.

Remember the original selling point of the shuttle was the concept that essentially everything could be re-used and thereby saving the costs of fabricating a new vehicle for each mission. Can the proposed systems do that? If not, they'll come in for the same criticism as the launch systems of the mid 1960s. The bean counters will hammer them to death.