Very well done! Good work on the tiles and cabin shape. The idea of flown material adds a nice little kick to the impact of the model. And crikey, it is BIG!! Seeing your hand holding the payload bay and Ku-band antenna gives a good idea of the sheer size of this model. Impressive!
For reinforcement I'd say you could use cardboard cross sections or just card strips that go all around the inside with cross-shaped beams for bulkheads. You might be able to use a marble to try and roll that pointy bit out of the nose cone.
- Dij t dut mout t waiten!