X-Wing project: Procedural Cave/Tunnel generation. First test

First look at the procedural system for generating caves/tunnels in the simulator.
This first version uses just 7 variations of cave type in the creation of the tunnel, I intend to add considerably more for variety in the future.
Apologies for bad 'section joins', need to tweak the entry/exit points for seamless connections.
* Todo:
-Split screen Vs racing module
-Realistic racing AI (currently AI is programmed for combat)
-Tunnel mounted turrets, creatures, falling obstacles etc..