I will need to do some intense modeling and model rigging with this project, but this and the level creation are all within my capabilities at the moment. It will only take time.
It took a team 7 years to complete this conversion to Unreal Tournament. I hope to accomplish my goal of a single level sooner than this, perhaps within a few months. We'll see how things go

Unreal Tournament conversion
I think my Marathon conversion project is more appropriate, seeing how Halo is the sequel to the Marathon series, and I would also be using a Bungie engine, so it keeps the whole thing 'in-house', so to speak.