Combination of selected bits of Pegasus, Telemaque, Spaceship 2, Blue steel missile, and Skylon.
Potential problem of shock-shock interaction if trying to use SS2’s elevons: they might melt off at higher Mach Numbers.
Also, SS2 folds up the rear part of its wings to move the wing centre of lift forward at high angles of attack for trimming: this reduces the effective wing area, but we need all the wing area we can get.
Use canard instead, which translates fore and aft to take the trim over large angle of attack range.
Wing anhedral (negative dihedral) to increase re-entry supersonic lift to reduce gees and heating.
Re-enter at angle of attack for max lift (around 60 degrees).
Needs CFD (Cranfield?) for aerodynamic tweaking.
2 nd and 3 rd stages carried in payload bay at vehicle C.G.