probably be really hard but at the same time what if I don't want to save vegas but rather shut it down ? or what if i just dont want any other factions to exist all of them are diffrent shades of grey and the white mask faction just creeps me out theres just something up with them

also how do you shut down mr house ? I opened the wall to his left and got vaporized by his securitrons before i even reached the next terminal .-. will I gain access to that area later on with out being vaporized for opening the wall ?

Not sure about the first part of your post, but if you want to shut down Mr. House, after you open up the wall, you should just sprint straight for the door on the other side of the room. In my case, not all Securitrons turned hostile, only the two you walk past on your way to House's room. Don't bother fighting them, just run past them before they get a chance to shoot you. Actually disabling Mr. House is easy enough, you'll see once you get there.

You can literally kill anyone and everyone EXCEPT Yes Man.

Yep, I did a playthru like that but was sided with Mr house. Yried to get all the assassin squads after me...sadly I had to console infamy with ncr as its so easyyy to get accepted with them and if ya do, theres nothing u can do if ur past the whole quest reset to nietral scenario as u can lay waste to every camp, civian, etc and only end up as wildchild. The ncr and bos seems lazy on wanting me dead as in I only got 1 or 2 death squads from them after hours and hours of playing, but the legion is topnotch in their commitment in wanting ya dead.

While in Skyrim, you can literally not kill anyone and everyone EXCEPT for a bandit.

Sorry, just had to.