"You say that the humans are computer right? So why not make it to where the player controls Master Chief and fights along side the humans?"
well, P1 and P7 are the marines, and the marines own the bases, and the SPARTANs go out and fight, so they DO fight along side eachother.
The 'Master Cheif' is the "last SPARTAN II"
I used the game as more of a guidline and not limits, the only people who will be able to build

would be the flood (to defend spawn areas), and the computer players (which are the marine encampments), so its still more of an RPG.
I tried matching the things from the game into the physical characteristics of the starcraft unit, not just soley their attack characteristics, a mapmaker did that, as a mimic of the first level and the 'Master Cheif (Plasma Pistol)' was an archon, the 'Master Cheif (Plasma Rifle)' was a dragoon, and the covenants were the hero units...
I find that the covenant have plenty of units, so i dont think they really need the ghost.
I did think of using Tassadar as an 'Elite [Plasma Rifle]' and maybe even the hydra as an 'Elite [Needler]' but the covenant players have about 9 units, 8 of which they spawn, and 1 of which they have to build, the SPARTAN's have six options of units to throw at their enemys, while the flood have 8 units they spawn.
I'm already running into problems where the covenant carve through the flood too easily, giving the covenant more options versus the flood would seem unfair and unbalanced, since i already stretched the flood units to the max, i dont want to do it.
I wouldve replicated a halo level, but the levels are either too long, or i just couldnt replicate them right with starcraft period.
1st level, could be done in installation, or space platform terrain.
2nd level, how to do the wierd structures/platforms and tunnels?
3rd level, badlands/twilight? terrain, space terrain (maybe split the level into two maps?)
4th level, its already been done, but you could try it in badlands...
5th level, Assault on the control room, its too big to put on 255/255, and in starforge when u increase the size past 255, you cant edit the terrain, and what about when you were inside? how you going to make the bottomless pit? and make it look good?
6th level, gunna haveto split the level into two maps, jungle terrain, installation terrain or space platform terrain for the flood portion...
7th level space platfrom terrain seems like it would most fit.
8th level, gunna have to split into snow and space platfrom terrains
9th level, jungle terrain or even twilight,space platform terrain,
10th level, installation, or space platform terrain would seem the easiest
In every level, theres atleast 2-3 things that you can not replicate/emmulate with starcraft period, so if you do without them, the player wouldnt recognize where the he** he was, and would make the map seem out of place.
thats why i didnt replicate a level/mission, itd take too much work replicating it than it would to do anything else.
I've seen in a map about where the gernade was a scourge, it was created as a comp player and went to the nearest of your enemys units, and where the gernade was an infested terran, and that is already in use(for the flood, and im not going to take anything away from the flood, unless its for a VERY good reason).
What should the gernades be, if i add them in.
I could give the SPARTAN's a rocket launcher, whihc could be an arbiter, or a gaurdian, cloaked, (using P161 for the arby) and give the SPARTAN a civilian so only the air unit he has will attack. I dont think i should add it in since it wont have any splash, but its an idea none the less.