I've started a flight simulator in first-person view for macosx xcode "el capitan". There's a project file included. It does not have graphics files yet, but you can make them in bender (http://blender3d.org or search google.)

The friendly bullet class needs a movement algorithm, usually Bresenham's algorithm in 3D.
The adapters (manipulators) also need to be refactored.
The source code is released under the APSL 2.0 and is available at http://brandywine-software.yellowcouch.org/macosx/       the comanche 3D entry

Enjoy!