Once all three of the Collect & Build sets are assembled, they can also be built into a boost frame. The boost frame is a non enclosed, one man space fighter, which was first seen in the Halo Legends animated short 'The Package.' Sadly, assembling the boost frame requires the complete disassembly of the smaller sets, and then rebuilding from step one. This is the norm, rather than the exception with these sorts of sets, but it would have been nice to see some parts being reused as is instead of completely scrapped.
The boost frame itself is rather fun. It's a detailed and scaled piece. Additionally, the stand has an angled flight base which makes it look as though the pilot is putting it through a banking turn, rather than being simply stationary.