The Launch isn't so much of a problem. Tubes, rods, rails, whatever can all be made to work I'm sure.
The big problem is aerodynamic surfaces at low pressures.
1. How to control the flight when the existing control surfaces have no effect? I think it has been suggested that this involves gyro's, vanes and complexity.
2. What happens if at high velocity they do start to have an effect? If the rocket achieves a great enough velocity that even the thin atmosphere gives some lift to the wings then rocket control may be compromised or the crafts glide controls may be damaged.