just a heads up, this is a prop/costume making forum not webMD lol
do yourself a favor and go seek a real doctor not advice from unqualified people online.
check therpf.com they have about 100 threads going right now with iron man helmets and how they are lighting the eyes. i'm really not sure though that there's any way for a light right in front of /around your eye to not affect your ability to see though.
it would really make more sense to make a suzuki banshee or some other quad with a big busa motor in it halo themed... i mean halo actually has quads. you might even be able to pull off a canam spyder as a halo theme. but any normal style 2 wheel bike be it chopper or crotch rocket would just...
found this on the first page without doing a search seems like it might just be able to answer all your questions... http://www.405th.com/showthread.php/18620-How-To-Scale-Your-Armour-Tutorial
just a heads up you'll probably get ripped on for asking questions that have been asked 100 times before. read the forum search around some and if you don't see an answer to your question then ask.
But i'm new here so what do i know
anywho just a quick youtube search yeilds lots of results...
it may help if you post a link to the actual ODST file you downloaded as well as a screenshot of what you see on your computer when you try to open it.